river vs Dnieper

river and Dnieper both are nouns.

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

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