complain vs kvetch

complain is not a noun while kvetch is a noun.

Word	Noun	Adjective	Verb	Adverb
complain	No	No	Yes	No
kvetch	Yes	No	Yes	No

As verbs, complain and kvetch are synonyms defined as:

complain and kvetch: express complaints, discontent, displeasure, or unhappiness

Other synonyms of complain include kick, plain, quetch, sound off.

complain (noun)	kvetch (noun)
	(Yiddish) a nagging complaint
	(Yiddish) a constant complainer

complain (verb)	kvetch (verb)
express complaints, discontent, displeasure, or unhappiness	express complaints, discontent, displeasure, or unhappiness
make a formal accusation; bring a formal charge