richness vs greenness

richness and greenness both are nouns.

Word	Noun	Adjective	Verb	Adverb
richness	Yes	No	No	No
greenness	Yes	No	No	No

As nouns, greenness is a hyponym of richness; that is, greenness is a word with a more specific, narrower meaning than richness:

Other hyponyms of richness include overgrowth, verdancy, verdure, wilderness.

richness (noun)	greenness (noun)
a strong deep vividness of hue	green color or pigment; resembling the color of growing grass
the property of a sensation that is rich and pleasing	the lush appearance of flourishing vegetation
the property of producing abundantly and sustaining vigorous and luxuriant growth	the state of not being ripe
the property of being extremely abundant
splendid or imposing in size or appearance
the quality of having high intrinsic value
abundant wealth