seminarian vs pupil

seminarian and pupil both are nouns.

Word	Noun	Adjective	Verb	Adverb
seminarian	Yes	No	No	No
pupil	Yes	No	No	No

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

Other hypernyms of seminarian include educatee, student.

seminarian (noun)	pupil (noun)
a student at a seminary (especially a Roman Catholic seminary)	the contractile aperture in the center of the iris of the eye; resembles a large black dot
	a learner who is enrolled in an educational institution
	a young person attending school (up through senior high school)