externalisation vs Australian spelling

externalisation and Australian spelling both are nouns.

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

externalisation (noun)	Australian spelling (noun)
embodying in an outward form	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')
attributing to outside causes