schoolfellow vs schoolmate

schoolfellow and schoolmate both are nouns.

Word	Noun	Adjective	Verb	Adverb
schoolfellow	Yes	No	No	No
schoolmate	Yes	No	No	No

As nouns, schoolfellow and schoolmate are synonyms defined as:

Other synonyms of schoolfellow include class fellow, classmate.

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