complainer vs crybaby

complainer and crybaby both are nouns.

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

As nouns, complainer and crybaby are synonyms defined as:

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

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

complainer (noun)	crybaby (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