collegian vs college man

collegian and college man both are nouns.

Word	Noun	Adjective	Verb	Adverb
collegian	Yes	No	No	No
college man	Yes	No	No	No

As nouns, collegian and college man are synonyms defined as:

collegian and college man: a student (or former student) at a college or university

Other synonyms of collegian include college boy.

collegian (noun)	college man (noun)
a student (or former student) at a college or university	a student (or former student) at a college or university