adversary vs doer

adversary and doer both are nouns.

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

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

Other hypernyms of adversary include actor, worker.

adversary (noun)	doer (noun)
someone who offers opposition	a person who acts and gets things done