"Hominy" can indicate most any dried field corn, but dried corn treated with lye or lime in a process known as nixtamalization is likewise called hominy.

WSJ: Hominy Is Back on the Menu

Grits may be simply ground corn or they may be hominy grits.

NPR: Kernels of Truth About Cornmeal

And cracked dried corn, properly called samp, is often labeled as hominy, too.

WSJ: Hominy Is Back on the Menu