synthesise vs Australian spelling

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

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

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

synthesise (verb)	Australian spelling (verb)
combine so as to form a more complex, product