class structure vs socio-economic class

class structure and socio-economic class both are nouns.

Word	Noun	Adjective	Verb	Adverb
class structure	Yes	No	No	No
socio-economic class	Yes	No	No	No

class structure (noun)	socio-economic class (noun)
the organization of classes within a society	people having the same social, economic, or educational status