metacentre vs Australian spelling

metacentre and Australian spelling both are nouns.

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

metacentre (noun)	Australian spelling (noun)
(shipbuilding) the point of intersection between two vertical lines, one line through the center of buoyancy of the hull of a ship in equilibrium and the other line through the center of buoyancy of the hull when the ship is inclined to one side; the distance of this intersection above the center of gravity is an indication of the stability of the ship	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')