colourful vs Australian spelling

colourful is not a noun while Australian spelling is a noun.

Word	Noun	Adjective	Verb	Adverb
colourful	No	Yes	No	No
Australian spelling	Yes	No	No	No

colourful (noun)	Australian spelling (noun)
	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')

colourful (adjective)	Australian spelling (adjective)
having much or varied color
striking in variety and interest
having color or a certain color; sometimes used in combination