crybaby vs complainer

crybaby and complainer both are nouns.

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

As nouns, crybaby and complainer are synonyms defined as:

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

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

crybaby (noun)	complainer (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