protester vs doer

protester and doer both are nouns.

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

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

Other hypernyms of protester include actor, worker.

protester (noun)	doer (noun)
someone who participates in a public display of group feeling	a person who acts and gets things done
a person who dissents from some established policy