decimalisation vs Australian spelling

decimalisation and Australian spelling both are nouns.

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

decimalisation (noun)	Australian spelling (noun)
the act of changing to a decimal system	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')