demimonde vs social class

demimonde and social class both are nouns.

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

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

demimonde: a class of woman not considered respectable because of indiscreet or promiscuous behavior
social class: people having the same social, economic, or educational status

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

demimonde (noun)	social class (noun)
a class of woman not considered respectable because of indiscreet or promiscuous behavior	people having the same social, economic, or educational status