Which is different, corn, banker, cotton or sorghum?

Does the subject want to ask "which is not the same kind of corn, cotton and sorghum?" Cotton. Corn and sorghum belong to Gramineae and cotton belongs to Malvaceae, so cotton in corn is not a category with cotton and sorghum. Corn belongs to Gramineae, also known as corn, corn cob, maize, pearl rice, etc.