viridity vs greenness

viridity and greenness both are nouns.

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

As nouns, viridity and greenness are synonyms defined as:

viridity and greenness: green color or pigment; resembling the color of growing grass

Other synonyms of viridity include green.

viridity (noun)	greenness (noun)
green color or pigment; resembling the color of growing grass	green color or pigment; resembling the color of growing grass
	the lush appearance of flourishing vegetation
	the state of not being ripe