bourgeoisie vs middle class

bourgeoisie and middle class both are nouns.

Word	Noun	Adjective	Verb	Adverb
bourgeoisie	Yes	No	No	No
middle class	Yes	No	No	No

As nouns, bourgeoisie and middle class are synonyms defined as:

bourgeoisie and middle class: the social class between the lower and upper classes

bourgeoisie (noun)	middle class (noun)
the social class between the lower and upper classes	the social class between the lower and upper classes