beau monde vs elite group

beau monde and elite group both are nouns.

Word	Noun	Adjective	Verb	Adverb
beau monde	Yes	No	No	No
elite group	Yes	No	No	No

As nouns, elite group is a hypernym of beau monde; that is, elite group is a word with a broader meaning than beau monde:

beau monde: the fashionable elite
elite group: a group or class of persons enjoying superior intellectual or social or economic status

Other hypernyms of beau monde include elite.

beau monde (noun)	elite group (noun)
the fashionable elite	a group or class of persons enjoying superior intellectual or social or economic status