cubic millimetre vs Australian spelling

cubic millimetre and Australian spelling both are nouns.

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

cubic millimetre (noun)	Australian spelling (noun)
a metric measure of volume or capacity equal to a cube 1 millimeter on each edge	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')