Buckeye State vs Ohio

Buckeye State and Ohio both are nouns.

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

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

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

Other synonyms of Buckeye State include OH.

Buckeye State (noun)	Ohio (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