emulator vs doer

emulator and doer both are nouns.

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

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

Other hypernyms of emulator include actor, worker.

emulator (noun)	doer (noun)
someone who copies the words or behavior of another	a person who acts and gets things done