cubic metre vs Australian spelling

cubic metre and Australian spelling both are nouns.

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

cubic metre (noun)	Australian spelling (noun)
a metric unit of volume or capacity equal to 1000 liters	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')