sniveller vs bellyacher

sniveller and bellyacher both are nouns.

Word	Noun	Adjective	Verb	Adverb
sniveller	Yes	No	No	No
bellyacher	Yes	No	No	No

As nouns, sniveller and bellyacher are synonyms defined as:

sniveller and bellyacher: a person given to excessive complaints and crying and whining

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

sniveller (noun)	bellyacher (noun)
a person given to excessive complaints and crying and whining	a person given to excessive complaints and crying and whining