river vs Garonne River

river and Garonne River both are nouns.

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

river (noun)	Garonne River (noun)
a large natural stream of water (larger than a creek)	a river that rises in the Pyrenees and flows northwest to the Bay of Biscay