jade green vs greenness

jade green and greenness both are nouns.

Word	Noun	Adjective	Verb	Adverb
jade green	Yes	No	No	No
greenness	Yes	No	No	No

As nouns, greenness is a hypernym of jade green; that is, greenness is a word with a broader meaning than jade green:

jade green: a light green color varying from bluish green to yellowish green
greenness: green color or pigment; resembling the color of growing grass

Other hypernyms of jade green include green, viridity.

jade green (noun)	greenness (noun)
a light green color varying from bluish green to yellowish green	green color or pigment; resembling the color of growing grass
	the lush appearance of flourishing vegetation
	the state of not being ripe