enrollee vs doer

enrollee and doer both are nouns.

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

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

enrollee: a person who enrolls in (or is enrolled in) a class or course of study
doer: a person who acts and gets things done

Other hypernyms of enrollee include actor, worker.

enrollee (noun)	doer (noun)
a person who enrolls in (or is enrolled in) a class or course of study	a person who acts and gets things done