Ohio vs Ohio River

Ohio and Ohio River both are nouns.

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

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

Ohio and Ohio River: a river that is formed in western Pennsylvania and flows westward to become a tributary of the Mississippi River

Ohio (noun)	Ohio River (noun)
a midwestern state in north central United States in the Great Lakes region, with capital Columbus	a river that is formed in western Pennsylvania and flows westward to become a tributary of the Mississippi River
a river that is formed in western Pennsylvania and flows westward to become a tributary of the Mississippi River