decentralising vs Australian spelling

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

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

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

decentralising (adjective)	Australian spelling (adjective)
tending away from a central point