abstinent vs doer

abstinent and doer both are nouns.

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

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

Other hypernyms of abstinent include actor, worker.

abstinent (noun)	doer (noun)
a person who refrains from drinking intoxicating beverages	a person who acts and gets things done

abstinent (adjective)	doer (adjective)
self-restraining; not indulging an appetite especially for food or drink