fraternity vs social class

fraternity and social class both are nouns.

Word	Noun	Adjective	Verb	Adverb
fraternity	Yes	No	No	No
social class	Yes	No	No	No

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

fraternity: people engaged in a particular occupation
social class: people having the same social, economic, or educational status

Other hypernyms of fraternity include class, socio-economic class, stratum.

fraternity (noun)	social class (noun)
people engaged in a particular occupation	people having the same social, economic, or educational status
a social club for male undergraduates