peck vs kvetch

peck and kvetch both are nouns.

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

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

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

peck (noun)	kvetch (noun)
a light kiss	(Yiddish) a nagging complaint
bite by a bird	(Yiddish) a constant complainer
(often followed by `of') a large number or amount or extent
a United States dry measure equal to 8 quarts or 537.605 cubic inches
a British imperial capacity measure (liquid or dry) equal to 2 gallons

peck (verb)	kvetch (verb)
bother persistently with trivial complaints	express complaints, discontent, displeasure, or unhappiness
eat by pecking at, like a bird
eat like a bird
kiss lightly
hit lightly with a picking motion