upper-class vs quality

upper-class is not a noun while quality is a noun.

Word	Noun	Adjective	Verb	Adverb
upper-class	No	Yes	No	No
quality	Yes	Yes	No	No

upper-class (noun)	quality (noun)
	an essential and distinguishing attribute of something or someone
	(music) the distinctive property of a complex sound (a voice or noise or musical sound)
	a degree or grade of excellence or worth
	a characteristic property that defines the apparent individual nature of something
	high social status

upper-class (adjective)	quality (adjective)
occupying the highest socioeconomic position in a society	of superior grade
	of high social status