grouch vs kvetch

grouch and kvetch both are nouns.

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

As verbs, kvetch is a hypernym of grouch; that is, kvetch is a word with a broader meaning than grouch:

Other hypernyms of grouch include complain, kick, plain, quetch, sound off.

grouch (noun)	kvetch (noun)
a bad-tempered person	(Yiddish) a nagging complaint
	(Yiddish) a constant complainer

grouch (verb)	kvetch (verb)
show one's unhappiness or critical attitude	express complaints, discontent, displeasure, or unhappiness