grunter vs squealer

grunter and squealer both are nouns.

Word	Noun	Adjective	Verb	Adverb
grunter	Yes	No	No	No
squealer	Yes	No	No	No

As nouns, grunter and squealer are synonyms defined as:

Other synonyms of grunter include hog, pig, Sus scrofa.

grunter (noun)	squealer (noun)
domestic swine	domestic swine
a person who grunts	one who reveals confidential information to the police or other authority