river vs Apalachicola River

river and Apalachicola River both are nouns.

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

river (noun)	Apalachicola River (noun)
a large natural stream of water (larger than a creek)	a river in northwestern Florida formed by the confluence of the Chattahoochee River and the Flint River at the Florida border