enrollee vs worker

enrollee and worker both are nouns.

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

As nouns, worker is a hypernym of enrollee; that is, worker 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
worker: a person who acts and gets things done

Other hypernyms of enrollee include actor, doer.

enrollee (noun)	worker (noun)
a person who enrolls in (or is enrolled in) a class or course of study	sterile member of a colony of social insects that forages for food and cares for the larvae
	a person who works at a specific occupation
	a member of the working class (not necessarily employed)
	a person who acts and gets things done