Australian spelling vs decolourise

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

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

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

Australian spelling (verb)	decolourise (verb)
	cause to become white or lighter in color