yellowness vs chromatic color

yellowness and chromatic color both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellowness	Yes	No	No	No
chromatic color	Yes	No	No	No

As nouns, chromatic color is a hypernym of yellowness; that is, chromatic color is a word with a broader meaning than yellowness:

yellowness: yellow color or pigment; the chromatic color resembling the hue of sunflowers or ripe lemons
chromatic color: a color that has hue

Other hypernyms of yellowness include chromatic colour, spectral color, spectral colour.

yellowness (noun)	chromatic color (noun)
yellow color or pigment; the chromatic color resembling the hue of sunflowers or ripe lemons	a color that has hue