low-class vs upper-lower-class

low-class and upper-lower-class both are adjectives.

Word	Noun	Adjective	Verb	Adverb
low-class	No	Yes	No	No
upper-lower-class	No	Yes	No	No

low-class (adjective)	upper-lower-class (adjective)
occupying the lowest socioeconomic position in a society	occupying the upper part of the lower class