As proper nouns the difference between ohio and greenfield
is that ohio
is a capital and largest city: columbus while greenfield
(en proper noun
A (USstate) Capital and largest city: Columbus.
A river flowing SW from Pennsylvania to the Mississippi River in Illinois.
A village in Illinois
A town in New York
One of three communities in Nova Scotia, Canada
* Ohio City
A site, to be used for housing or commerce, whose previous use (if any) was agricultural