Find the odd number / letters / word from the given alternative:

Head can be used as a noun to refer to the top part of a person’s body, or as a verb to mean “to be in charge of something.” Heed can be used as a noun to refer to attention or care, or as a verb to mean “to pay attention to something.” Heap can be used as a noun to refer to a large pile of things, or as a verb to mean “to pile something up.” Led can only be used as a verb to mean “to guide or direct someone or something.”