Volta River vs Volta

Volta River and Volta both are nouns.

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

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

Volta River and Volta: a river in Ghana that flows south to the Bight of Benin

Volta River (noun)	Volta (noun)
a river in Ghana that flows south to the Bight of Benin	a river in Ghana that flows south to the Bight of Benin
	Italian physicist after whom the volt is named; studied electric currents and invented the voltaic pile (1745-1827)