grumbler vs squawker

grumbler and squawker both are nouns.

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

As nouns, grumbler and squawker are synonyms defined as:

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

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

grumbler (noun)	squawker (noun)
a person given to excessive complaints and crying and whining	the loudspeaker on an intercom or public address system
	a person given to excessive complaints and crying and whining