brotherhood vs social class

brotherhood and social class both are nouns.

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

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

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

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

brotherhood (noun)	social class (noun)
the feeling that men should treat one another like brothers	people having the same social, economic, or educational status
people engaged in a particular occupation
an organization of employees formed to bargain with the employer
the kinship relation between a male offspring and the siblings