Australia vs Murray River

Australia and Murray River both are nouns.

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

Australia (noun)	Murray River (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 southeast Australian river; flows westward and then south into the Indian Ocean at Adelaide
the smallest continent; between the South Pacific and the Indian Ocean