polymerisation vs Australian spelling

polymerisation and Australian spelling both are nouns.

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

polymerisation (noun)	Australian spelling (noun)
a chemical process that combines several monomers to form a polymer or polymeric compound	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')