low-class vs working-class

low-class and working-class both are adjectives.

Word	Noun	Adjective	Verb	Adverb
low-class	No	Yes	No	No
working-class	No	Yes	No	No

low-class (adjective)	working-class (adjective)
occupying the lowest socioeconomic position in a society	working for hourly wages rather than fixed (e.g. annual) salaries
	of those who work for wages especially manual or industrial laborers