follower vs doer

follower and doer both are nouns.

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

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

Other hypernyms of follower include actor, worker.

follower (noun)	doer (noun)
a person who accepts the leadership of another	a person who acts and gets things done
someone who travels behind or pursues another