squawk vs bellyache

squawk and bellyache both are nouns.

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

As verbs, squawk and bellyache are synonyms defined as:

Other synonyms of squawk include beef, bitch, crab, gripe, grouse, holler.

squawk (noun)	bellyache (noun)
informal terms for objecting	an ache localized in the stomach or abdominal region
the noise of squawking

squawk (verb)	bellyache (verb)
complain	complain
utter a harsh abrupt scream