depersonalisation vs Australian spelling

depersonalisation and Australian spelling both are nouns.

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

depersonalisation (noun)	Australian spelling (noun)
representing a human being as a physical thing deprived of personal qualities or individuality	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')
emotional dissociative disorder in which there is loss of contact with your own personal reality accompanied by feelings of unreality and strangeness
(existentialism) a loss of personal identity; a feeling of being an anonymous cog in an impersonal social machine