Australian spelling vs colourful

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

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

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

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