river vs Chattahoochee River

river and Chattahoochee River both are nouns.

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

river (noun)	Chattahoochee River (noun)
a large natural stream of water (larger than a creek)	a river rising in northern Georgia and flowing southwest and south to join the Flint River at the Florida border where they form the Apalachicola River