improvise vs Australian spelling

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

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

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

improvise (verb)	Australian spelling (verb)
perform without preparation
manage in a makeshift way; do with whatever is at hand