spectral colour vs Australian spelling

spectral colour and Australian spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
spectral colour	Yes	No	No	No
Australian spelling	Yes	No	No	No

spectral colour (noun)	Australian spelling (noun)
a color that has hue	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')