billabong vs Australia

billabong and Australia both are nouns.

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

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