The corn cob is the word you're looking for by changing one letter in the word mob.
cob
Corn Coon Coop Chop Shop
an ear of corn
what word can you make by changing one letter in the word winter
corn (as the base for corn syrup)
ear
corn
ear
Pone (although it is more commonly called corn pone).
· Indian corn · Indians
Maize.
corn, cart, cowe.