captor vs doer

captor and doer both are nouns.

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

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

Other hypernyms of captor include actor, worker.

captor (noun)	doer (noun)
a person who captures and holds people or animals	a person who acts and gets things done