squealer vs grunter

squealer and grunter both are nouns.

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

As nouns, squealer and grunter are synonyms defined as:

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

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