maximisation vs Australian spelling

maximisation and Australian spelling both are nouns.

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

maximisation (noun)	Australian spelling (noun)
the act of raising to the highest possible point or condition or position	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')