Which grain is also known as maize?

an unshucked ear of corn has a strand of silk for each kernel of corn

NB: USA is not the only country in the world. Corn is not synonymous with maize. Corn is a term for any staple cereal crop. Maize is a corn, but so are rye, wheat, barley, oats etc.

What language does the term (maize) come from?

Corn, very good can make a variety of dishes. As a lover of corn bread, and corn on the cob butter a little salt, delicious.