scholar vs pupil

scholar and pupil both are nouns.

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

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

Other hypernyms of scholar include educatee, student.

scholar (noun)	pupil (noun)
a learned person; someone who by long study has gained mastery in one or more disciplines	the contractile aperture in the center of the iris of the eye; resembles a large black dot
someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs	a learner who is enrolled in an educational institution
a student who holds a scholarship	a young person attending school (up through senior high school)