frat vs social club

frat and social club both are nouns.

Word	Noun	Adjective	Verb	Adverb
frat	Yes	No	No	No
social club	Yes	No	No	No

As nouns, social club is a hypernym of frat; that is, social club is a word with a broader meaning than frat:

Other hypernyms of frat include club, gild, guild, lodge, order, society.

frat (noun)	social club (noun)
a social club for male undergraduates	a formal association of people with similar interests