antagonist vs doer

antagonist and doer both are nouns.

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

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

Other hypernyms of antagonist include actor, worker.

antagonist (noun)	doer (noun)
a drug that neutralizes or counteracts the effects of another drug	a person who acts and gets things done
a muscle that relaxes while another contracts
someone who offers opposition