Yenisei River vs Yenisei

Yenisei River and Yenisei both are nouns.

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

As nouns, Yenisei River and Yenisei are synonyms defined as:

Yenisei River and Yenisei: a Russian river in Siberia; rises in mountains near the Mongolian border and flows generally northward into the Kara Sea

Other synonyms of Yenisei River include Yenisey, Yenisey River.

Yenisei River (noun)	Yenisei (noun)
a Russian river in Siberia; rises in mountains near the Mongolian border and flows generally northward into the Kara Sea	the Uralic language spoken by the Yeniseian
	a Russian river in Siberia; rises in mountains near the Mongolian border and flows generally northward into the Kara Sea