Savannah vs Savannah River

Savannah and Savannah River both are nouns.

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

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

Savannah and Savannah River: a river in South Carolina that flows southeast to the Atlantic

Savannah (noun)	Savannah River (noun)
a port in eastern Georgia near the mouth of the Savannah river	a river in South Carolina that flows southeast to the Atlantic
a river in South Carolina that flows southeast to the Atlantic