Ohio River vs Ohio

Ohio River and Ohio both are nouns.

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

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

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

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