crammer vs pupil

crammer and pupil both are nouns.

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

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

Other hypernyms of crammer include educatee, student.

crammer (noun)	pupil (noun)
a textbook designed for cramming	the contractile aperture in the center of the iris of the eye; resembles a large black dot
a special school where students are crammed	a learner who is enrolled in an educational institution
a student who crams	a young person attending school (up through senior high school)
a teacher who is paid to cram students for examinations