sea green vs viridity

sea green and viridity both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea green	Yes	No	No	No
viridity	Yes	No	No	No

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

sea green: the property of a moderate green color resembling the waters of the sea
viridity: green color or pigment; resembling the color of growing grass

Other hypernyms of sea green include green, greenness.

sea green (noun)	viridity (noun)
the property of a moderate green color resembling the waters of the sea	green color or pigment; resembling the color of growing grass