blueness vs spectral colour

blueness and spectral colour both are nouns.

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

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

blueness: blue color or pigment; resembling the color of the clear sky in the daytime
spectral colour: a color that has hue

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

blueness (noun)	spectral colour (noun)
blue color or pigment; resembling the color of the clear sky in the daytime	a color that has hue