nag vs kvetch

nag and kvetch both are nouns.

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

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

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

nag (noun)	kvetch (noun)
an old or over-worked horse	(Yiddish) a nagging complaint
someone (especially a woman) who annoys people by constantly finding fault	(Yiddish) a constant complainer

nag (verb)	kvetch (verb)
remind or urge constantly	express complaints, discontent, displeasure, or unhappiness
bother persistently with trivial complaints
worry persistently