pupil vs scholar

pupil and scholar both are nouns.

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

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

pupil (noun)	scholar (noun)
the contractile aperture in the center of the iris of the eye; resembles a large black dot	a learned person; someone who by long study has gained mastery in one or more disciplines
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
a young person attending school (up through senior high school)	a student who holds a scholarship