proletariat vs working class

proletariat and working class both are nouns.

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

As nouns, proletariat and working class are synonyms defined as:

proletariat and working class: a social class comprising those who do manual labor or work for wages

Other synonyms of proletariat include labor, labour.

proletariat (noun)	working class (noun)
a social class comprising those who do manual labor or work for wages	a social class comprising those who do manual labor or work for wages