chrome green vs greenness

chrome green and greenness both are nouns.

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

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

Other hypernyms of chrome green include green, viridity.

chrome green (noun)	greenness (noun)
a brilliant green color	green color or pigment; resembling the color of growing grass
any of a class of green pigments consisting of chrome yellow and iron blue	the lush appearance of flourishing vegetation
	the state of not being ripe