blonde vs spectral colour

blonde and spectral colour both are nouns.

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

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

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

blonde (noun)	spectral colour (noun)
a light grayish yellow to near white	a color that has hue
a female person with fair skin and hair

blonde (adjective)	spectral colour (adjective)
being or having light colored skin and hair and usually blue or grey eyes