crybaby vs grumbler

crybaby and grumbler both are nouns.

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

As nouns, crybaby and grumbler are synonyms defined as:

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

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

crybaby (noun)	grumbler (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