middle-class vs lower-middle-class

middle-class and lower-middle-class both are adjectives.

Word	Noun	Adjective	Verb	Adverb
middle-class	No	Yes	No	No
lower-middle-class	No	Yes	No	No

middle-class (adjective)	lower-middle-class (adjective)
occupying a socioeconomic position intermediate between those of the lower classes and the wealthy	occupying the lower part of the middle socioeconomic range in a society