river vs Yenisey River

river and Yenisey River both are nouns.

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

river (noun)	Yenisey River (noun)
a large natural stream of water (larger than a creek)	a Russian river in Siberia; rises in mountains near the Mongolian border and flows generally northward into the Kara Sea