Tennessee River vs river

Tennessee River and river both are nouns.

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

Tennessee River (noun)	river (noun)
a river formed by the confluence of two other rivers near Knoxville; it follows a U-shaped course to become a tributary of the Ohio River in western Kentucky	a large natural stream of water (larger than a creek)