crybaby vs bellyacher

crybaby and bellyacher both are nouns.

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

As nouns, crybaby and bellyacher are synonyms defined as:

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

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

crybaby (noun)	bellyacher (noun)
a person given to excessive complaints and crying and whining	a person given to excessive complaints and crying and whining
a person who lacks confidence, is irresolute and wishy-washy