authorise vs Australian spelling

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

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

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

authorise (verb)	Australian spelling (verb)
grant authorization or clearance for
give or delegate power or authority to