Complaint vs complain is a common English word-form confusion because the two words are closely related and describe the same general idea: expressing dissatisfaction. The important difference is grammatical.
Complaint is a noun. It refers to the problem, objection, expression of dissatisfaction, or formal statement itself.
Complain is a verb. It describes the action of saying that something is wrong, unpleasant, unfair, or unsatisfactory.
That small difference changes how you build a sentence. You make a complaint, but you complain about something.
You can receive a complaint, but you cannot normally say that someone “received a complain.”
This distinction matters in everyday conversation, customer service, business emails, academic writing, and formal situations. Once you understand the word forms, the choice becomes much easier.
This guide explains complaint vs complain with clear grammar rules, pronunciation, common patterns, professional examples, common mistakes, and simple memory tricks.
Quick Answer
Complaint is a noun: it names a complaint or expression of dissatisfaction.
Complain is a verb: it describes the act of saying that something is wrong or unsatisfactory.
- Correct: I want to make a complaint.
- Correct: I want to complain about the service.
- Incorrect: I want to make a complain.
- Incorrect: I want to complaint about the service.
In short: complaint = thing/issue; complain = action.
Complaint vs Complain: Comparison Table
| Feature | Complaint | Complain |
|---|---|---|
| Part of speech | Noun | Verb |
| Basic meaning | A statement, reason, or expression of dissatisfaction | To express dissatisfaction |
| Pronunciation | /kəmˈpleɪnt/ | /kəmˈpleɪn/ |
| Main grammatical role | Names the complaint | Describes the act of complaining |
| Common pattern | make a complaint | complain about something |
| Another common pattern | file a complaint | complain to someone |
| Formal use | formal complaint | formally complain |
| Business use | customer complaint | customer complains |
| Academic use | a complaint about a policy | students complain about a policy |
| Everyday use | My main complaint is the noise. | I always complain about the noise. |
| Can take an object directly? | Yes, as a noun phrase | Usually not in the sense of “complain something” |
| Correct preposition | complaint about, against, from, to | complain about, to, of |
| Past form | complaint remains a noun | complained |
| -ing form | complaint does not become a verb | complaining |
| Person who complains | complainant/complainer, depending on context | — |
| Typical mistake | Using complain as a noun | Using complaint as a verb |
| US vs UK | Both standard | Both standard |
| Formality | Can be neutral or formal | Neutral; can sound negative depending on context |
| Easy memory | Complaint = the thing | Complain = the action |
What Does “Complaint” Mean?
Complaint is a noun. It refers to an expression of dissatisfaction, a reason for being dissatisfied, or a formal statement that something is wrong.
For example:
My main complaint is the poor customer service.
Here, complaint names the problem or objection.
You can think of a complaint as the thing that exists because someone is unhappy about something.
Complaint as a statement of dissatisfaction
A complaint can be spoken or written:
- I have a complaint about the food.
- We received three complaints from customers.
- She made a complaint about the noise.
- His biggest complaint was the long waiting time.
Cambridge Dictionary defines complaint as a statement that something is wrong or not satisfactory. It also identifies uses in formal, business, and legal contexts.
Complaint as a reason for dissatisfaction
Sometimes complaint means the particular problem or reason someone is unhappy.
For example:
The biggest complaint about the new system is its speed.
The complaint here is not necessarily a formal document. It is the specific source of dissatisfaction.
Other examples:
- My only complaint is the price.
- Her main complaint was the lack of parking.
- The quality of the food was his biggest complaint.
- Their complaint concerned the company’s delivery policy.
Complaint in formal situations
In professional writing, complaint is especially common.
You may see phrases such as:
- make a complaint
- file a complaint
- lodge a complaint
- receive a complaint
- handle a complaint
- investigate a complaint
- respond to a complaint
- resolve a complaint
- withdraw a complaint
- a formal complaint
- a written complaint
- a customer complaint
For example:
The company has received several complaints about delayed deliveries.
Please submit your complaint in writing.
The manager is responsible for handling customer complaints.
Oxford lists patterns such as complaint about, complaint against, complaint from, and complaint to, as well as expressions such as file a complaint and lodge a complaint.
Complaint in law
Complaint also has a specialized legal meaning. In some legal systems, it can refer to a formal document or allegation that begins a legal proceeding or formally alleges wrongdoing.
For example:
The plaintiff filed a complaint against the company.
This is more technical than the everyday meaning.
You should not assume that every use of complaint is legal, however. In ordinary English, it simply refers to an expression or reason for dissatisfaction.
Complaint and health
There is another, less common but established meaning.
A complaint can refer to an illness or physical problem, especially in expressions such as:
- a stomach complaint
- a skin complaint
- a minor complaint
For example:
The patient has a minor respiratory complaint.
This meaning is more formal or traditional than the everyday meaning of dissatisfaction. Oxford and Cambridge both record this medical sense.
What Does “Complain” Mean?
Complain is a verb. It means to say that something is wrong, unsatisfactory, unpleasant, unfair, or annoying.
For example:
Customers complained about the slow service.
The word complained describes what the customers did.
Cambridge defines complain as saying that something is wrong or not satisfactory, and it also gives the common pattern complain to someone about something.
Complain about something
One of the most important patterns is:
complain about + thing/problem
Examples:
- complain about the noise
- complain about the price
- complain about the service
- complain about the weather
- complain about the delay
- complain about a decision
For example:
Several passengers complained about the delay.
Don’t complain about every little problem.
A common mistake is to use complain directly with the thing being complained about:
❌ I want to complain the service.
The standard pattern is:
✅ I want to complain about the service.
Cambridge’s grammar guidance specifically notes that complain about is the normal construction and that complain something is incorrect in this meaning.
Complain to someone
Use complain to + person/organization when you want to identify the person or organization receiving the complaint.
I complained to the manager.
She complained to the airline.
We complained to the school principal.
You can combine both patterns:
complain to someone about something
I complained to the manager about the service.
This sentence tells us both who received the complaint and what the complaint was about.
Complain that…
You can also use complain + that-clause.
She complained that the room was too cold.
The employees complained that they were working too many hours.
Several students complained that the instructions were unclear.
This structure is particularly useful in professional and academic writing.
Complain of something
Complain of is another recognized pattern, especially when talking about pain, illness, or physical symptoms.
The patient complained of severe pain.
He complained of a headache.
Cambridge and Oxford both record complain of as a legitimate usage pattern.
In ordinary conversation, however, complain about is usually the more familiar pattern when discussing an unwanted situation.
Complaint vs Complain: The Core Grammar Difference
The easiest way to understand complaint vs complain is to identify their parts of speech.
Complaint = noun
A noun names a person, place, thing, idea, event, or concept.
Complaint names the expression, reason, issue, or formal statement of dissatisfaction.
Her complaint was reasonable.
We received a complaint.
The manager investigated the complaint.
Complain = verb
A verb describes an action, event, or state.
Complain describes the action of expressing dissatisfaction.
She complained about the service.
They complain too much.
He is complaining about the noise.
The distinction is similar to other noun/verb pairs:
| Noun | Verb |
|---|---|
| decision | decide |
| discussion | discuss |
| explanation | explain |
| invitation | invite |
| complaint | complain |
The forms are related, but they do not perform the same grammatical job.
Complaint: I have a complaint.
Complain: I want to complain.
That simple contrast solves most complaint vs complain questions.
Complaint vs Complain: How to Use Them in a Sentence
The sentence structure is often the clearest way to choose the correct word.
Use “complaint” after articles
Because complaint is a noun, it can appear after words such as a, an, the, my, your, this, and that.
- a complaint
- the complaint
- my complaint
- your complaint
- their complaint
- this complaint
Examples:
I have a complaint.
My complaint is about the delivery.
The complaint was investigated.
You cannot use complain in these structures:
❌ I have a complain.
❌ My complain is about the delivery.
Use “complain” after auxiliary verbs
Because complain is a verb, it can follow auxiliary verbs such as do, will, can, should, and have in the appropriate form.
- I do complain sometimes.
- We will complain if the problem continues.
- You should complain to the manager.
- They have complained before.
Examples:
You should complain about the poor service.
She has complained about this problem several times.
Pronunciation: Complaint vs Complain
The pronunciation difference is small but useful.
Complaint: /kəmˈpleɪnt/
Complain: /kəmˈpleɪn/
The final t is pronounced in complaint.
Compare:
- complaint → ends with a /t/ sound
- complain → ends with an /n/ sound
The stress falls on the second syllable in both words:
com-PLAINT
com-PLAIN
The words sound similar because they belong to the same word family, but their endings help distinguish the noun from the verb.
Complaint vs Complain in Everyday English
In casual conversation, both words are extremely useful, but they appear in different sentence patterns.
Using “complain”
Why are you always complaining?
I don’t want to complain, but this coffee is cold.
He complained about the weather all day.
Using “complaint”
I have one complaint.
My only complaint is the noise.
That’s a fair complaint.
Notice the difference:
Action:
She complained about the food.
Thing:
Her complaint was about the food.
The meaning is related, but the grammar changes.
Complaint vs Complain in Professional Writing
Business English often requires a clear distinction because complaints can become formal records.
Consider these two sentences:
The customer complained about the damaged package.
This focuses on the customer’s action.
The customer submitted a complaint about the damaged package.
This focuses on the formal communication or issue.
Both can be correct, but they are not identical in emphasis.
Useful business expressions
With complaint:
- customer complaint
- formal complaint
- written complaint
- complaint procedure
- complaint department
- complaint handling
- complaint form
- complaint process
- complaint investigation
With complain:
- complain about a service
- complain to a manager
- complain that something is wrong
- complain about a delay
- complain of a problem
For a formal customer-service context:
We have received your complaint and are currently investigating the matter.
For a less formal description:
The customer complained about the delayed delivery.
Complaint vs Complain in Academic Writing
Academic writing generally favors precise descriptions rather than emotional language.
Complaint works well when discussing objections, concerns, or documented dissatisfaction:
The primary complaint among students was the lack of study space.
Complain can be used when reporting what people said or did:
Several students complained that the examination schedule was inconvenient.
A more formal academic alternative may sometimes be preferable:
- report a problem
- raise a concern
- express dissatisfaction
- object to
- criticize
- identify a problem
For example:
The participants complained about the lack of information.
can become:
The participants expressed dissatisfaction with the lack of information.
The best choice depends on tone and purpose.
20+ Real-Life Examples of Complaint vs Complain
Here are original examples across different situations.
Everyday conversation
- I don’t want to complain, but this room is freezing.
- My only complaint is that the restaurant closes too early.
- Why do you always complain about the weather?
- She made a complaint about the noise upstairs.
- He never complains, even when things go wrong.
Customer service
- The customer complained about the damaged product.
- We received a complaint from a customer yesterday.
- I’d like to make a complaint about my order.
- Please contact support if you have a complaint.
- The customer complained to the manager about the delay.
Business
- Several employees complained about the new schedule.
- The company received a formal complaint from a client.
- Management is reviewing the complaint.
- She complained that the deadline was unrealistic.
- The HR department handles workplace complaints.
- I am writing to complain about the service I received.
- I am writing to make a formal complaint regarding my recent order.
- We have received your complaint and will respond shortly.
- I would like to complain about the incorrect invoice.
- Thank you for bringing your complaint to our attention.
School
- The students complained about the difficult assignment.
- The teacher received a complaint from a parent.
- Several students complained that the instructions were confusing.
- Her complaint concerned the amount of homework.
Social media
- People are complaining about the new update.
- My biggest complaint about the app is its slow loading time.
Text message
- I’m not complaining, but we’re already an hour late.
- I have one complaint: you finished all the pizza!
Professional writing
- The investigation began after a formal complaint was submitted.
- The report explains how employees can complain about workplace issues.
Academic writing
- The most common complaint among respondents was the lack of access to resources.
- Participants complained that the instructions were unclear.
These examples show that the two words often express the same underlying idea, but their grammatical roles remain different.
Common Mistakes with Complaint and Complain
The biggest errors occur when writers treat the noun as a verb or the verb as a noun.
Mistake 1: “Make a complain”
❌ I want to make a complain.
Why is it wrong?
After make a, English needs a noun. Complaint is the noun.
Correct:
✅ I want to make a complaint.
Mistake 2: “I want to complaint”
❌ I want to complaint about the service.
Why is it wrong?
After want to, English needs the base form of a verb. Complain is the verb.
Correct:
✅ I want to complain about the service.
Mistake 3: “I complained the service”
❌ I complained the service.
For the ordinary meaning of expressing dissatisfaction about something, use complain about.
Correct:
✅ I complained about the service.
Cambridge specifically identifies complain about as the standard pattern in this context.
Mistake 4: “She made a complain”
❌ She made a complain to the manager.
Correct:
✅ She made a complaint to the manager.
Or:
✅ She complained to the manager.
Mistake 5: “He has many complain”
❌ He has many complain.
Because many refers to countable plural nouns, use complaints.
Correct:
✅ He has many complaints.
Mistake 6: “She is complaint”
❌ She is complaint about the food.
Correct:
✅ She is complaining about the food.
Here, the continuous verb form is required.
Mistake 7: “I have a complain”
❌ I have a complain.
Correct:
✅ I have a complaint.
Mistake 8: “Complaint about” vs “complain about”
Both can be followed by about, but their grammatical structures are different.
Noun:
I have a complaint about the service.
Verb:
I want to complain about the service.
This is one of the most useful contrasts to remember.
Word Forms and the Complaint Word Family
Understanding the word family makes the distinction easier.
Complain
Verb
- complain
- complains
- complained
- complaining
Examples:
I complain about the noise.
She complains about everything.
He complained yesterday.
They are complaining now.
Complaint
Noun
- complaint
- complaints
Examples:
We received one complaint.
We received several complaints.
Complainant
Noun
A complainant is a person who makes a formal complaint, especially in legal or official contexts.
Example:
The complainant provided additional evidence.
Complainer
Noun
A complainer is someone who complains, often suggesting that the person complains frequently.
Example:
He’s a constant complainer.
There is therefore a useful distinction:
complain → action
complaint → thing/issue
complainant → person making a formal complaint
complainer → person who complains, often repeatedly
Common Collocations with “Complaint”
Natural English often depends on collocations—words that commonly occur together.
Useful combinations include:
- make a complaint
- file a complaint
- lodge a complaint
- receive a complaint
- handle a complaint
- investigate a complaint
- resolve a complaint
- address a complaint
- respond to a complaint
- withdraw a complaint
- a formal complaint
- a serious complaint
- a customer complaint
- a written complaint
- a complaint about something
- a complaint against someone
Examples:
The company has a clear procedure for handling customer complaints.
She decided to file a formal complaint.
The manager promised to investigate the complaint.
Common Collocations with “Complain”
Common patterns include:
- complain about something
- complain to someone
- complain to someone about something
- complain that…
- complain of something
- complain bitterly
- complain constantly
- complain loudly
- complain repeatedly
Examples:
Customers complained about the price.
She complained to the manager.
He complained that the room was too small.
The patient complained of chest pain.
The preposition is important. In ordinary usage, avoid constructions such as complain for something when you mean “express dissatisfaction about something.” Cambridge’s grammar guidance recommends complain about in that situation.
Why Do People Confuse Complaint and Complain?
There are several reasons.
First, the words are from the same family and have almost the same meaning.
Second, their spelling is very similar:
complain
complaint
Only the ending changes.
Third, many languages form related noun and verb forms differently, so English learners may naturally treat complaint as a verb.
Finally, both words can occur in very similar sentences:
She complained about the service.
She made a complaint about the service.
The meaning is closely connected, but the grammar is not interchangeable.
Complaint vs Complain: Are They Interchangeable?
No.
They are related, but you cannot freely substitute one for the other.
Compare:
I want to complain about the noise.
You cannot replace the verb with the noun:
❌ I want to complaint about the noise.
Instead, change the structure:
I want to make a complaint about the noise.
Likewise:
I have a complaint about the noise.
You cannot simply replace the noun with the verb:
❌ I have a complain about the noise.
The correct verb construction is:
I complain about the noise.
Is “Complaint” a Verb?
In standard modern English, complaint is used as a noun, not as the ordinary verb meaning “to express dissatisfaction.”
Use:
complain
not:
complaint
So:
❌ Customers can complaint about the service.
✅ Customers can complain about the service.
And:
❌ We received a complain.
✅ We received a complaint.
Is “Complain” a Noun?
In ordinary standard English, complain is a verb.
If you need the noun, use complaint.
❌ His complain was reasonable.
✅ His complaint was reasonable.
This is particularly important in formal writing because noun and verb errors can make otherwise clear writing sound non-native.
Formal vs Informal Use
Neither complaint nor complain is inherently informal.
Both are standard English words used in everyday, professional, academic, official, and legal contexts.
However, complain can sometimes sound negative depending on the situation.
Compare:
She complained about the noise.
This may simply report what she did.
She is always complaining about the noise.
This suggests criticism of her behavior.
By contrast:
She made a formal complaint about the noise.
sounds official and procedural.
If you want a softer professional tone, alternatives may include:
- raise a concern
- report an issue
- bring a problem to someone’s attention
- express concern
- request assistance
For example:
I would like to raise a concern about the current process.
may sound more diplomatic than:
I want to complain about the current process.
US vs UK English
There is no major US-versus-UK difference between complaint and complain.
Both forms are standard in American and British English.
You can use:
- complaint in US English
- complaint in UK English
- complain in US English
- complain in UK English
The main issue is not regional preference but part of speech and sentence structure.
Pronunciation is also essentially the same across the two varieties, with normal regional differences in accent.
Historical Origin of Complaint and Complain
The relationship between these words is not accidental.
Complain entered English through Middle English, from Anglo-French forms related to compleindre, ultimately connected to Latin complangere, meaning to lament or mourn. Merriam-Webster dates the first known use of complain in English to the 14th century.
Complaint also has Middle English roots and came through Old French complainte, from the same broader Latin family. Oxford traces the noun to the Old French form associated with lamenting.
Over time, the related forms developed distinct grammatical roles:
complain → verb
complaint → noun
That historical relationship helps explain why the words look and sound so similar today.
Memory Tricks for Complaint vs Complain
You do not need to memorize complicated grammar rules.
Try these simple tricks.
Trick 1: T = Thing
complainT has a T at the end.
Think:
T = Thing
A complaint is the thing being expressed or recorded.
I have a complaint.
Trick 2: Complain = Action
If someone is doing the complaining, use the verb:
She complains.
If you are talking about what was made, received, or filed, use the noun:
She made a complaint.
Trick 3: “Make” goes with complaint
Remember this pair:
make a complaint
Not:
❌ make a complain
Trick 4: “Want to” goes with complain
Remember:
want to complain
Not:
❌ want to complaint
Quick memory formula
MAKE → COMPLAINT
WANT TO → COMPLAIN
RECEIVE → COMPLAINT
DID → COMPLAINED
IS → COMPLAINING
This formula will solve most everyday mistakes.
Quick Guide: Which One Should You Use?
Use complaint when the word functions as a noun.
I have a complaint.
We received a complaint.
She made a complaint.
The complaint was investigated.
Use complain when the word functions as a verb.
I want to complain.
We complained yesterday.
She is complaining.
They complain about the service.
Ask yourself one question
Am I naming the complaint or describing the action?
If you are naming it → complaint
If you are describing the action → complain
FAQs
Is “complaint” a noun or a verb?
Complaint is a noun. It refers to an expression, reason, issue, or formal statement of dissatisfaction.
Example:
The customer made a complaint.
Is “complain” a noun or a verb?
Complain is a verb. It describes the act of expressing dissatisfaction.
Example:
The customer complained about the service.
Which is correct: “make a complaint” or “make a complain”?
Make a complaint is correct.
✅ I would like to make a complaint.
❌ I would like to make a complain.
The reason is simple: make a requires the noun complaint.
Which is correct: “complain about” or “complaint about”?
Both can be correct, but they belong to different grammatical structures.
I complain about the service. — verb
I have a complaint about the service. — noun
So the choice depends on the sentence.
Can I say “I want to complaint”?
No. After want to, use the base-form verb:
✅ I want to complain.
Not:
❌ I want to complaint.
Can I say “I have a complain”?
No. Use the noun:
✅ I have a complaint.
What is the difference between “complaint” and “complaining”?
Complaint is a noun referring to an expression or reason for dissatisfaction.
Complaining is the -ing form of the verb complain, and it can describe the activity of repeatedly or currently expressing dissatisfaction.
His complaint was about the price.
His constant complaining annoyed everyone.
Is “complain to” correct?
Yes.
Use complain to + person or organization:
I complained to the manager.
You can also say:
I complained to the manager about the service.
Is “complain about” correct?
Yes. Complain about + thing/problem is one of the most common patterns.
She complained about the noise.
They complained about the price.
Is complaint used in legal English?
Yes. Complaint has a specialized legal meaning in addition to its ordinary meaning. It can refer to a formal allegation or legal document, depending on the legal system and context.
Final Verdict
The difference between complaint vs complain is mainly a difference in part of speech.
Complaint = noun
It names the dissatisfaction, problem, objection, expression, or formal statement.
I made a complaint about the service.
Complain = verb
It describes the action of expressing dissatisfaction.
I complained about the service.
The best rule to remember
You make, file, receive, or handle a complaint.
You complain about something or complain to someone.
So these are correct:
- make a complaint
- file a complaint
- receive a complaint
- handle a complaint
- complain about something
- complain to someone
- complain that something is wrong
- complain of pain or illness
And these common forms are incorrect in standard modern English:
- ❌ make a complain
- ❌ I have a complain
- ❌ I want to complaint
- ❌ complain the service
The easiest way to remember the distinction is complaint is the thing; complain is the action.
Once you recognize whether your sentence needs a noun or a verb, choosing between the two becomes straightforward.
In one line: You have a complaint, but you complain about a problem.
Evan Bennett is a language enthusiast who writes simple, clear guides about word meanings, slang, phrases, and everyday expressions.
He helps readers understand modern language quickly with easy explanations and useful examples.