Complaint vs Lawsuit

When to use each in English, with meaning, register, and examples.

Complaint

Top 2,000 (common)B1noun

Lawsuit

FormalTop 3,000 (common)C1noun
Most formal: LawsuitMost common: Complaint
 ComplaintLawsuit
Pronunciation🇬🇧 /["/kəmˈpleɪnt/"]/🇺🇸 /["/kəmˈpleɪnt/"]/🇬🇧 /["/ˈlɔːsuːt/"]/🇺🇸 /["/ˈlɔːsuːt/"]/
MeaningA statement saying that something is wrong or not good.A legal case someone brings to court.
ExampleI filed a complaint with the manager about the poor service.The company faced a lawsuit for violating environmental regulations.
RegisterNeutralFormal
How commonTop 2,000 (common)Top 3,000 (common)
CEFR levelB1C1
Part of speechnounnoun
Collocationsserious, common, familiar, have, bring, file, arise, concern something, relate to something, complaint procedure, complaints procedure, complaint system, complaint about, complaint against, complaint from, cause for complaint, grounds for complaint, a chorus of complaint, minor, chronic, common, have, suffer fromfile a lawsuit, settle a lawsuit, win a lawsuit, lose a lawsuit, lawsuit against
Antonymspraise, complimentsettlement, agreement, compromise
Common mistakesUsing 'complaint' as a verb (it is a noun)., Confusing 'complaint' with 'complaining' (the action of expressing dissatisfaction)., Omitting the article 'a' before 'complaint' when necessary.Confused with 'suit' meaning clothing., Used in informal contexts, which sounds awkward., Misused 'lawsuit' as a verb.
Usage notesUse 'complaint' in contexts where someone expresses dissatisfaction. It's appropriate in both spoken and written forms but should be avoided in very casual settings.Used in formal contexts, particularly in legal discussions. Not appropriate in casual conversations. Common in news articles about legal matters.

Frequently asked questions: Complaint vs Lawsuit

What's the difference between Complaint and Lawsuit?

Complaint: A statement saying that something is wrong or not good. Lawsuit: A legal case someone brings to court.

Which is more formal: Complaint and Lawsuit?

Lawsuit is the most formal of these.

Which is more common: Complaint and Lawsuit?

Complaint is the most common in everyday English.

Which is more advanced: Complaint and Lawsuit?

Lawsuit is the highest level, at C1, on the CEFR scale.

Are Complaint and Lawsuit the same CEFR level?

Complaint: B1, Lawsuit: C1 on the CEFR scale.

What part of speech are Complaint and Lawsuit?

Complaint: noun, Lawsuit: noun.

Can you show an example of each?

Complaint: I filed a complaint with the manager about the poor service. Lawsuit: The company faced a lawsuit for violating environmental regulations.

Can I use Complaint and Lawsuit interchangeably?

Not always. Complaint and Lawsuit are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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