Flint River vs river

Flint River and river both are nouns.

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

Flint River (noun)	river (noun)
a river in western Georgia that flows generally south to join the Chattahoochee River at the Florida border where they form the Apalachicola River	a large natural stream of water (larger than a creek)