discriminator vs doer

discriminator and doer both are nouns.

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

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

Other hypernyms of discriminator include actor, worker.

discriminator (noun)	doer (noun)
a person who (or that which) differentiates	a person who acts and gets things done