In many countries, corn is the name given to the leading crop grown in certain districts. Also, in England, it is wheat, while in Scotland and Ireland, it relates to oats. In the Bible, corn is nothing but wheat and barley.
However, in USA and Canada corn and maize are one and the same and are meant for the plant that produces kernels used for cooking. But, the term corn is preferred over maize for food products that are made from it, such as corn flour, corn starch, cornmeal, etc.