destabilisation vs Australian spelling

destabilisation and Australian spelling both are nouns.

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

destabilisation (noun)	Australian spelling (noun)
the action of destabilizing; making something less stable (especially of a government or country or economy)	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')