picometre vs Australian spelling

picometre and Australian spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
picometre	Yes	No	No	No
Australian spelling	Yes	No	No	No

picometre (noun)	Australian spelling (noun)
a metric unit of length equal to one trillionth of a meter	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')