unionise vs Australian spelling

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

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

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

unionise (verb)	Australian spelling (verb)
form or join a union
recruit for a union or organize into a union