Australian spelling vs categorise

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

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

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

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