college boy vs student

college boy and student both are nouns.

Word	Noun	Adjective	Verb	Adverb
college boy	Yes	No	No	No
student	Yes	No	No	No

As nouns, student is a hypernym of college boy; that is, student is a word with a broader meaning than college boy:

Other hypernyms of college boy include educatee, pupil.

college boy (noun)	student (noun)
a student (or former student) at a college or university	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