square centimetre vs Australian spelling

square centimetre and Australian spelling both are nouns.

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

square centimetre (noun)	Australian spelling (noun)
a unit of area measurement equivalent to 1 centimeter in length multiplied by 1 centimeter in width, where one centimeter equals 0.3937 inch.	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')