labor force vs working class

labor force and working class both are nouns.

Word	Noun	Adjective	Verb	Adverb
labor force	Yes	No	No	No
working class	Yes	No	No	No

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

labor force: the source of trained people from which workers can be hired
working class: a social class comprising those who do manual labor or work for wages

Other hypernyms of labor force include labor, labour, proletariat.

labor force (noun)	working class (noun)
the source of trained people from which workers can be hired	a social class comprising those who do manual labor or work for wages