disorganisation vs Australian spelling

disorganisation and Australian spelling both are nouns.

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

disorganisation (noun)	Australian spelling (noun)
the disturbance of a systematic arrangement causing disorder and confusion	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')
a condition in which an orderly system has been disrupted