squawker vs bellyacher

squawker and bellyacher both are nouns.

Word	Noun	Adjective	Verb	Adverb
squawker	Yes	No	No	No
bellyacher	Yes	No	No	No

As nouns, squawker and bellyacher are synonyms defined as:

squawker and bellyacher: a person given to excessive complaints and crying and whining

Other synonyms of squawker include complainer, crybaby, grumbler, moaner, sniveller, whiner.

squawker (noun)	bellyacher (noun)
the loudspeaker on an intercom or public address system	a person given to excessive complaints and crying and whining
a person given to excessive complaints and crying and whining