Synonyms for Hydrofoil (same or very similar meaning)
WordNet sense 1 (a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through):
foilWordNet sense 2 (a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds):
hydroplaneFrom the ODE community, based on WordNetadd/edit