optimise vs Australian spelling

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

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

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

optimise (verb)	Australian spelling (verb)
act as an optimist and take a sunny view of the world
make optimal; get the most out of; use best
modify to achieve maximum efficiency in storage capacity or time or cost