restrainer vs doer

restrainer and doer both are nouns.

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

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

Other hypernyms of restrainer include actor, worker.

restrainer (noun)	doer (noun)
a person who directs and restrains	a person who acts and gets things done
a chemical that is added to a photographic developer in order to retard development and reduce the amount of fog on a film