directivity vs quality

directivity and quality both are nouns.

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

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

directivity (noun)	quality (noun)
the property of a microphone or antenna of being more sensitive in one direction than in another	an essential and distinguishing attribute of something or someone
the quality of being directive	(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

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