categorise vs Australian spelling

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

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

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

categorise (verb)	Australian spelling (verb)
place into or assign to a category