Alabama River vs river

Alabama River and river both are nouns.

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

Alabama River (noun)	river (noun)
a river in Alabama formed by the confluence of the Coosa and Tallapoosa Rivers near Montgomery; flows southwestward to become a tributary of the Mobile River	a large natural stream of water (larger than a creek)