society vs beau monde

society and beau monde both are nouns.

Word	Noun	Adjective	Verb	Adverb
society	Yes	No	No	No
beau monde	Yes	No	No	No

As nouns, society and beau monde are synonyms defined as:

Other synonyms of society include bon ton, high society, smart set.

society (noun)	beau monde (noun)
an extended social group having a distinctive cultural and economic organization	the fashionable elite
a formal association of people with similar interests
the fashionable elite
the state of being with someone