Tallapoosa River vs river

Tallapoosa River and river both are nouns.

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

Tallapoosa River (noun)	river (noun)
river that rises in northwestern Georgia and flows southwest through central Alabama to join the Coosa River near Montgomery and form the Alabama River	a large natural stream of water (larger than a creek)