Australia vs Australia

Australia and Australia both are nouns.

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

Australia (noun)	Australia (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	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	the smallest continent; between the South Pacific and the Indian Ocean