catholic metre vs Australian spelling

catholic metre and Australian spelling both are nouns.

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

catholic metre (noun)	Australian spelling (noun)
a unit of length equivalent to the length of a free seconds pendulum; differs from the modern metre by half a centimetre, introduced by Tito Livio Burattini in 1675.	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')