sulphurous vs Australian spelling

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

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

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

sulphurous (adjective)	Australian spelling (adjective)
of or related to or containing sulfur or derived from sulfur
characterized by oppressive heat and humidity
harsh or corrosive in tone