moaner vs grumbler

moaner and grumbler both are nouns.

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

As nouns, moaner and grumbler are synonyms defined as:

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

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

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