socio-economic class vs stratum

socio-economic class and stratum both are nouns.

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

As nouns, socio-economic class and stratum are synonyms defined as:

socio-economic class and stratum: people having the same social, economic, or educational status

Other synonyms of socio-economic class include class, social class.

socio-economic class (noun)	stratum (noun)
people having the same social, economic, or educational status	an abstract place usually conceived as having depth
	a subpopulation divided into a stratified sampling
	people having the same social, economic, or educational status
	one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)