middle class vs class

middle class and class both are nouns.

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

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

Other hypernyms of middle class include social class, socio-economic class, stratum.

middle class (noun)	class (noun)
the social class between the lower and upper classes	education imparted in a series of lessons or meetings
	elegance in dress or behavior
	a collection of things sharing a common attribute
	people having the same social, economic, or educational status
	(biology) a taxonomic group containing one or more orders
	a body of students who are taught together
	a body of students who graduate together
	a league ranked by quality

middle class (verb)	class (verb)
	arrange or order by classes or categories