enrollee vs student

enrollee and student both are nouns.

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

As nouns, student is a hyponym of enrollee; that is, student is a word with a more specific, narrower meaning than enrollee:

enrollee: a person who enrolls in (or is enrolled in) a class or course of study
student: a learner who is enrolled in an educational institution

Other hyponyms of enrollee include educatee, pupil.

enrollee (noun)	student (noun)
a person who enrolls in (or is enrolled in) a class or course of study	a learner who is enrolled in an educational institution
	someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs