Dnieper vs river

Dnieper and river both are nouns.

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

Dnieper (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)