kilometre vs Australian spelling

kilometre and Australian spelling both are nouns.

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

kilometre (noun)	Australian spelling (noun)
a metric unit of length equal to 1000 meters (or 0.621371 miles)	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')