James River vs river

James River and river both are nouns.

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

James River (noun)	river (noun)
a river that rises in North Dakota and flows southward across South Dakota to the Missouri	a large natural stream of water (larger than a creek)
a river in Virginia that flows east into Chesapeake Bay at Hampton Roads