class fellow vs schoolmate

class fellow and schoolmate both are nouns.

Word	Noun	Adjective	Verb	Adverb
class fellow	Yes	No	No	No
schoolmate	Yes	No	No	No

As nouns, class fellow and schoolmate are synonyms defined as:

Other synonyms of class fellow include classmate, schoolfellow.

class fellow (noun)	schoolmate (noun)
an acquaintance that you go to school with	an acquaintance that you go to school with