whiner vs grumbler

whiner and grumbler both are nouns.

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

As nouns, whiner and grumbler are synonyms defined as:

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

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

whiner (noun)	grumbler (noun)
a person given to excessive complaints and crying and whining	a person given to excessive complaints and crying and whining