Australia vs sealed

Australia is a noun but sealed is not a noun.

Word	Noun	Adjective	Verb	Adverb
Australia	Yes	No	No	No
sealed	No	Yes	No	No

Australia (noun)	sealed (noun)
a nation occupying the whole of the Australian continent; Aboriginal tribes are thought to have migrated from southeastern Asia 20,000 years ago; first Europeans were British convicts sent there as a penal colony
the smallest continent; between the South Pacific and the Indian Ocean

Australia (adjective)	sealed (adjective)
	closed or secured with or as if with a seal
	established irrevocably
	undisclosed for the time being
	determined irrevocably
	apply a non-porous coating to something so as to ensure it is impervious
	covered with a waterproof coating
	(of walls) covered with a coat of plaster