olive vs spectral colour

olive and spectral colour both are nouns.

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

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

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

olive (noun)	spectral colour (noun)
a yellow-green color of low brightness and saturation	a color that has hue
one-seeded fruit of the European olive tree usually pickled and used as a relish
evergreen tree cultivated in the Mediterranean region since antiquity and now elsewhere; has edible shiny black fruits
small ovoid fruit of the European olive tree; important food and source of oil
hard yellow often variegated wood of an olive tree; used in cabinetwork

olive (adjective)	spectral colour (adjective)
of a yellow-green color similar to that of an unripe olive