centralisation vs Australian spelling

centralisation and Australian spelling both are nouns.

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

centralisation (noun)	Australian spelling (noun)
the act of consolidating power under a central control	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')
gathering to a center