pink vs spectral colour

pink and spectral colour both are nouns.

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

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

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

pink (noun)	spectral colour (noun)
a light shade of red	a color that has hue
a person with mildly leftist political views
any of various flowers of plants of the genus Dianthus cultivated for their fragrant flowers

pink (adjective)	spectral colour (adjective)
of a light shade of red

pink (verb)	spectral colour (verb)
cut in a zigzag pattern with pinking shears, in sewing
make light, repeated taps on a surface
sound like a car engine that is firing too early