fluoridise vs Australian spelling

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

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

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

fluoridise (verb)	Australian spelling (verb)
subject to fluoridation; treat with fluoride