controller vs doer

controller and doer both are nouns.

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

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

Other hypernyms of controller include actor, worker.

controller (noun)	doer (noun)
a mechanism that controls the operation of a machine	a person who acts and gets things done
someone who maintains and audits business accounts
a person who directs and restrains