river vs Murrumbidgee

river and Murrumbidgee both are nouns.

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

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