Yazoo River vs Yazoo

Yazoo River and Yazoo both are nouns.

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

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

Yazoo River and Yazoo: a river that rises in west central Mississippi and flows southwest to empty into the Mississippi River above Vicksburg

Yazoo River (noun)	Yazoo (noun)
a river that rises in west central Mississippi and flows southwest to empty into the Mississippi River above Vicksburg	a river that rises in west central Mississippi and flows southwest to empty into the Mississippi River above Vicksburg