degrader vs doer

degrader and doer both are nouns.

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

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

degrader: a person who lowers the quality or character or value (as by adding cheaper metal to coins)
doer: a person who acts and gets things done

Other hypernyms of degrader include actor, worker.

degrader (noun)	doer (noun)
a person who lowers the quality or character or value (as by adding cheaper metal to coins)	a person who acts and gets things done