characterisation vs Australian spelling

characterisation and Australian spelling both are nouns.

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

characterisation (noun)	Australian spelling (noun)
a graphic or vivid verbal description	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')
the act of describing distinctive characteristics or essential features