etymologise vs Australian spelling

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

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

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

etymologise (verb)	Australian spelling (verb)
construct the history of words
give the etymology or derivation or suggest an etymology (for a word)