symmetrise vs Australian spelling

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

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

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

symmetrise (verb)	Australian spelling (verb)
make symmetric