kvetch vs complaint

kvetch and complaint both are nouns.

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

As nouns, complaint is a hypernym of kvetch; that is, complaint is a word with a broader meaning than kvetch:

kvetch (noun)	complaint (noun)
(Yiddish) a nagging complaint	an expression of grievance or resentment
(Yiddish) a constant complainer	(formerly) a loud cry (or repeated cries) of pain or rage or sorrow
	(civil law) the first pleading of the plaintiff setting out the facts on which the claim for relief is based
	(criminal law) a pleading describing some wrong or offense
	an often persistent bodily disorder or disease; a cause for complaining

kvetch (verb)	complaint (verb)
express complaints, discontent, displeasure, or unhappiness