Namoi River vs river

Namoi River and river both are nouns.

Word	Noun	Adjective	Verb	Adverb
Namoi River	Yes	No	No	No
river	Yes	No	No	No

Namoi River (noun)	river (noun)
a river in southeastern Australia that flows generally northwest to join the Darling River	a large natural stream of water (larger than a creek)