“Complain” is a verb meaning to express dissatisfaction, while “complaint” is a noun naming the statement or feeling of dissatisfaction itself. You complain about something, but you file a complaint. Mixing them up is one of the most common slips in everyday and business English, and it usually comes down to forgetting which word does the action and which one names the thing.
The Short Answer
Both words are correct — they just do different jobs in a sentence.
- Complain is a verb: “I complain when the Wi-Fi is slow.”
- Complaint is a noun: “I filed a complaint about the slow Wi-Fi.”
If you can swap the word for “protest” or “object” and the sentence still works, you need “complain.” If you can swap it for “issue” or “grievance,” you need “complaint.”
Why People Mix Them Up
The confusion happens because the two words look and sound alike, and English speakers often reach for whichever one feels more natural in the moment rather than checking the grammar. It doesn’t help that plenty of nouns in English end in “-t” while their verb forms drop it (think “consent” vs. “consent,” which is actually the same word — English isn’t consistent here at all). With complain/complaint, the pattern is simpler once you notice it: the noun has an extra syllable and an extra “t” sound at the end.
A Quick Memory Trick
Think of “complaint” as something you can hold: a form, a letter, a ticket. If you can picture it as a physical or written thing, it’s the noun. “Complain” is the action you take before that thing ever exists — you complain first, and sometimes that turns into a formal complaint.
Examples in a Sentence
| Correct Use of “Complain” (Verb) | Correct Use of “Complaint” (Noun) |
|---|---|
| She complained about the noise next door. | She submitted a noise complaint to the landlord. |
| Customers complain when shipping is delayed. | We received three complaints about shipping delays. |
| Please don’t complain in front of the client. | The client’s complaint was handled within 24 hours. |
| He has nothing to complain about. | He has no complaints about the service. |
Common Phrases That Trip People Up
- “File a complaint” — not “file a complain.” Always the noun after “file.”
- “I don’t want to complain, but…” — the verb, since it follows “to.”
- “No complaints here” — the plural noun, a common everyday phrase meaning “everything’s fine.”
- “Complaint department” — always the noun form in compound phrases like this, “complaint letter,” or “complaint form.”
Related Word Forms
It helps to see the full family so the pattern sticks:
- Complain — verb (base form): “They complain daily.”
- Complained — past tense verb: “They complained yesterday.”
- Complaining — present participle: “They are complaining again.”
- Complaint — noun: “Their complaint was valid.”
- Complainant — a more formal noun for the person making a complaint, common in legal contexts: “The complainant testified in court.”
Which to Use When
Ask yourself what role the word plays in your sentence. If it follows “to” or acts as the main action (“I complain,” “you shouldn’t complain”), use the verb. If it follows an article like “a” or “the,” or a possessive like “my” or “their,” you almost certainly need the noun: “a complaint,” “my complaint,” “their complaint.”
Key Takeaways
- Complain is a verb — the act of expressing dissatisfaction.
- Complaint is a noun — the statement, letter, or feeling of dissatisfaction.
- You file a complaint, but you complain about a problem.
- If an article (“a,” “the”) or possessive comes before the word, use “complaint.”
- If the word follows “to” or stands as the sentence’s action, use “complain.”
Frequently Asked Questions
Is it “I have a complain” or “I have a complaint”?
It’s “I have a complaint.” Because “complaint” follows the article “a,” it must be the noun. “Complain” is never used with “a” in front of it.
Is it “make a complain” or “make a complaint”?
“Make a complaint” is correct. “Make” needs a noun object, and “complaint” is that noun. You’d say “I want to make a complaint about the delivery.”
How do you use “complain” correctly in a sentence?
Use “complain” as a verb describing the act of expressing displeasure, often followed by “about” or “to”: “She likes to complain about the weather” or “He complained to the manager.”
What is the plural of “complaint”?
The plural is “complaints.” There is no plural of “complain” since it’s a verb, not a noun — it changes form with tense instead (complain, complains, complained, complaining).
What’s the difference between “complaint” and “complainant”?
“Complaint” is the issue or statement being raised. “Complainant” is the person raising it — a term used mainly in legal or formal disciplinary settings, such as “the complainant filed a lawsuit.”
Can “complaint” ever be used as a verb?
No. “Complaint” is strictly a noun in modern English. If you need a verb, “complain” (or its forms complained, complaining) is the only option.
Once you spot the pattern — verb for the action, noun for the thing — complain and complaint stop being a guessing game. If mixed-up word pairs like this keep catching you off guard, browse a few more entries on Meaningiffied for quick, no-nonsense clarity.
