Australian spelling vs achromatic colour

Australian spelling and achromatic colour both are nouns.

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

Australian spelling (noun)	achromatic colour (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	a color lacking hue; white or grey or black