complaint vs kvetch

complaint and kvetch both are nouns.

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

As nouns, kvetch is a hyponym of complaint; that is, kvetch is a word with a more specific, narrower meaning than complaint:

Other hyponyms of complaint include grievance, grumble, grumbling, murmur, murmuring, mutter, muttering, jeremiad, pet peeve, whimper, whine.

complaint (noun)	kvetch (noun)
an expression of grievance or resentment	(Yiddish) a nagging complaint
(formerly) a loud cry (or repeated cries) of pain or rage or sorrow	(Yiddish) a constant complainer
(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

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