grumbler vs whiner

grumbler and whiner both are nouns.

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

As nouns, grumbler and whiner are synonyms defined as:

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

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

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