linear metre vs Australian spelling

linear metre and Australian spelling both are nouns.

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

linear metre (noun)	Australian spelling (noun)
a meter in which the deflection of the pointer is proportional to the quantity measured.	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')