forgiver vs doer

forgiver and doer both are nouns.

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

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

Other hypernyms of forgiver include actor, worker.

forgiver (noun)	doer (noun)
a person who pardons or forgives or excuses a fault or offense	a person who acts and gets things done