Volta vs Volta River

Volta and Volta River both are nouns.

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

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

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

Volta (noun)	Volta River (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)