Australia vs Australian

Australia and Australian both are nouns.

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

Australia (noun)	Australian (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 Austronesian languages spoken by Australian aborigines
the smallest continent; between the South Pacific and the Indian Ocean	a native or inhabitant of Australia

Australia (adjective)	Australian (adjective)
	of or relating to or characteristic of Australia or its inhabitants or its languages