river vs Murrumbidgee River

river and Murrumbidgee River both are nouns.

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

river (noun)	Murrumbidgee River (noun)
a large natural stream of water (larger than a creek)	a river of southeastern Australia; flows westward into the Murray River