demon vs doer

demon and doer both are nouns.

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

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

Other hypernyms of demon include actor, worker.

demon (noun)	doer (noun)
an evil supernatural being	a person who acts and gets things done
a cruel wicked and inhuman person
someone extremely diligent or skillful