salariat vs working class

salariat and working class both are nouns.

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

As nouns, working class is a hypernym of salariat; that is, working class is a word with a broader meaning than salariat:

salariat: the class of workers who are salaried and get regular, non-hourly pay checks.
working class: a social class comprising those who do manual labor or work for wages

Other hypernyms of salariat include labor, labour, proletariat.

salariat (noun)	working class (noun)
the class of workers who are salaried and get regular, non-hourly pay checks.	a social class comprising those who do manual labor or work for wages