ostracise vs Australian spelling

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

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

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

ostracise (verb)	Australian spelling (verb)
avoid speaking to or dealing with
expel from a community or group