bookclub vs social club

bookclub and social club both are nouns.

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

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

bookclub: a club that people join in order to buy selected books at reduced prices
social club: a formal association of people with similar interests

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

bookclub (noun)	social club (noun)
a club that people join in order to buy selected books at reduced prices	a formal association of people with similar interests