Australian spelling vs apostatise

Australian spelling is a noun but apostatise is not a noun.

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

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

Australian spelling (verb)	apostatise (verb)
	abandon one's beliefs or allegiances