Dnieper River vs river

Dnieper River and river both are nouns.

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

Dnieper River (noun)	river (noun)
a river that rises in Russia near Smolensk and flowing south through Belarus and Ukraine to empty into the Black Sea	a large natural stream of water (larger than a creek)