Australia vs Aboriginal Australian

Australia and Aboriginal Australian both are nouns.

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

Australia (noun)	Aboriginal 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