orange vs spectral colour

orange and spectral colour both are nouns.

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

As nouns, spectral colour is a hypernym of orange; that is, spectral colour is a word with a broader meaning than orange:

orange: orange color or pigment; any of a range of colors between red and yellow
spectral colour: a color that has hue

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

orange (noun)	spectral colour (noun)
orange color or pigment; any of a range of colors between red and yellow	a color that has hue
round yellow to orange fruit of any of several citrus trees
any citrus tree bearing oranges
any pigment producing the orange color

orange (adjective)	spectral colour (adjective)
of the color between red and yellow; similar to the color of a ripe orange