bellyache vs kvetch

bellyache and kvetch both are nouns.

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

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

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

bellyache (noun)	kvetch (noun)
an ache localized in the stomach or abdominal region	(Yiddish) a nagging complaint
	(Yiddish) a constant complainer

bellyache (verb)	kvetch (verb)
complain	express complaints, discontent, displeasure, or unhappiness