bullfighter vs doer

bullfighter and doer both are nouns.

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

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

Other hypernyms of bullfighter include actor, worker.

bullfighter (noun)	doer (noun)
someone who fights bulls	a person who acts and gets things done