Arkansas vs OK

Arkansas and OK both are nouns.

Word	Noun	Adjective	Verb	Adverb
Arkansas	Yes	No	No	No
OK	Yes	No	No	Yes

Arkansas (noun)	OK (noun)
a state in south central United States; one of the Confederate states during the American Civil War	an endorsement
a river that rises in the Rocky Mountains in Colorado and flows southeast through Kansas and Oklahoma and through Arkansas to become a tributary of the Mississippi River	a state in south central United States

Arkansas (adverb)	OK (adverb)
	an expression of agreement normally occurring at the beginning of a sentence