student vs passer

student and passer both are nouns.

Word	Noun	Adjective	Verb	Adverb
student	Yes	No	No	No
passer	Yes	No	No	No

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

student (noun)	passer (noun)
a learner who is enrolled in an educational institution	(football) a ball carrier who tries to gain ground by throwing a forward pass
someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs	a person who passes by casually or by chance
	a student who passes an examination
	a person who passes as a member of a different ethnic or racial group