river vs Tallapoosa River

river and Tallapoosa River both are nouns.

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

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