immunise vs Australian spelling

immunise is not a noun while Australian spelling is a noun.

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

immunise (noun)	Australian spelling (noun)
	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')

immunise (verb)	Australian spelling (verb)
perform vaccinations or produce immunity in by inoculation
grant immunity from prosecution