grunter vs doer

grunter and doer both are nouns.

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

As nouns, doer is a hypernym of grunter; that is, doer is a word with a broader meaning than grunter:

Other hypernyms of grunter include actor, worker.

grunter (noun)	doer (noun)
domestic swine	a person who acts and gets things done
a person who grunts