Yenisei River vs river

Yenisei River and river both are nouns.

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

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