Australia vs billabong

Australia and billabong both are nouns.

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

Australia (noun)	billabong (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 branch of a river made by water flowing from the main stream only when the water level is high
the smallest continent; between the South Pacific and the Indian Ocean	a stagnant pool of water in the bed of a stream that flows intermittently