WordNet sense 1 (a column of wood or steel or concrete that is driven into the ground to provide support for a structure):

pile, piling, spile

WordNet sense 2 (long-legged three-toed wading bird of brackish marshes of Australia):

Australian stilt

WordNet sense 3 (long-legged three-toed black-and-white wading bird of inland ponds and marshes or brackish lagoons):

longlegs, long-legs, stiltbird, Himantopus stilt, stilt plover