Ohio vs Buckeye State

Ohio and Buckeye State both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ohio	Yes	No	No	No
Buckeye State	Yes	No	No	No

As nouns, Ohio and Buckeye State are synonyms defined as:

Ohio and Buckeye State: a midwestern state in north central United States in the Great Lakes region, with capital Columbus

Other synonyms of Ohio include OH.

Ohio (noun)	Buckeye State (noun)
a midwestern state in north central United States in the Great Lakes region, with capital Columbus	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