low quality vs quality

low quality and quality both are nouns.

Word	Noun	Adjective	Verb	Adverb
low quality	Yes	No	No	No
quality	Yes	Yes	No	No

As nouns, quality is a hypernym of low quality; that is, quality is a word with a broader meaning than low quality:

Other hypernyms of low quality include caliber, calibre.

low quality (noun)	quality (noun)
an inferior quality	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

low quality (adjective)	quality (adjective)
	of superior grade
	of high social status