Western Australia vs Australia

Western Australia and Australia both are nouns.

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

Western Australia (noun)	Australia (noun)
a state containing the western third of Australia	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