WordNet sense 1 (a hard thickening of the skin (especially on the top or sides of the toes) caused by the pressure of ill-fitting shoes):

clavus

WordNet sense 2 (tall annual cereal grass bearing kernels on large ears: widely cultivated in America in many varieties; the principal cereal in Mexico and Central and South America since pre-Columbian times):

maize, Indian corn, Zea mays

WordNet sense 3 (whiskey distilled from a mash of not less than 80 percent corn):

corn whiskey, corn whisky

WordNet sense 4 (ears of corn grown for human food):

edible corn