Australian spelling vs square kilometre

Australian spelling and square kilometre both are nouns.

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

Australian spelling (noun)	square kilometre (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	a decimal multiple of the unit of surface area, the square metre, equal to 1,000,000 square meters.