immunisation vs Australian spelling

immunisation and Australian spelling both are nouns.

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

immunisation (noun)	Australian spelling (noun)
the act of making immune (especially by inoculation)	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')