working class vs worker

working class and worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
working class	Yes	No	No	No
worker	Yes	No	No	No

working class (noun)	worker (noun)
a social class comprising those who do manual labor or work for wages	sterile member of a colony of social insects that forages for food and cares for the larvae
	a person who works at a specific occupation
	a member of the working class (not necessarily employed)
	a person who acts and gets things done