rowing club vs social club

rowing club and social club both are nouns.

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

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

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

rowing club (noun)	social club (noun)
a club for rowers	a formal association of people with similar interests