Ivy Leaguer vs pupil

Ivy Leaguer and pupil both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ivy Leaguer	Yes	No	No	No
pupil	Yes	No	No	No

As nouns, pupil is a hypernym of Ivy Leaguer; that is, pupil is a word with a broader meaning than Ivy Leaguer:

Other hypernyms of Ivy Leaguer include educatee, student.

Ivy Leaguer (noun)	pupil (noun)
a student at an Ivy League school	the contractile aperture in the center of the iris of the eye; resembles a large black dot
a graduate at an Ivy League school	a learner who is enrolled in an educational institution
	a young person attending school (up through senior high school)