desensitisation vs Australian spelling

desensitisation and Australian spelling both are nouns.

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

desensitisation (noun)	Australian spelling (noun)
the process of reducing sensitivity	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')