chromatic colour vs spectral colour

chromatic colour and spectral colour both are nouns.

Word	Noun	Adjective	Verb	Adverb
chromatic colour	Yes	No	No	No
spectral colour	Yes	No	No	No

As nouns, chromatic colour and spectral colour are synonyms defined as:

Other synonyms of chromatic colour include chromatic color, spectral color.

chromatic colour (noun)	spectral colour (noun)
a color that has hue	a color that has hue