Ohio vs OH

Ohio and OH both are nouns.

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

As nouns, Ohio and OH are synonyms defined as:

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

Other synonyms of Ohio include Buckeye State.

Ohio (noun)	OH (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