Maize n. : A large species of American grass of the genus Zea (Z. Mays), widely cultivated as a forage and food plant; Indian corn. Also, its seed, growing on cobs, and used as food for men animals.

Example:
could anyone tell me what's the difference between Maize and corn?

Taxonomy
maize, ears, kernels, Zea mays, corn, plant, teosinte, maize kernels, pellagra, crop, United States, cob, silk, seeds, stalk, grain, harvest, Food.

Defination from the web:
... After European contact with the Americas in the late 15th and early 16th centuries, maize spread to the rest of the world. ...