Australian spelling vs optimise

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

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

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

Australian spelling (verb)	optimise (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