cornucopia vs greenness

cornucopia and greenness both are nouns.

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

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

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

cornucopia (noun)	greenness (noun)
the property of being extremely abundant	green color or pigment; resembling the color of growing grass
a goat's horn filled with grain and flowers and fruit symbolizing prosperity	the lush appearance of flourishing vegetation
	the state of not being ripe