socio-economic class vs class structure

socio-economic class and class structure both are nouns.

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

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