externalise vs Australian spelling

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

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

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

externalise (verb)	Australian spelling (verb)
make external or objective, or give reality to
regard as objective