cubic kilometre vs Australian spelling

cubic kilometre and Australian spelling both are nouns.

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

cubic kilometre (noun)	Australian spelling (noun)
a unit of capacity equal to the volume of a cube one kilometer on each edge	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')