#walnut  nut of any of various walnut trees having a wrinkled two-lobed seed with a hard shell
  supertype:  edible_nut  a hard-shelled seed consisting of an edible kernel or meat enclosed in a woody or leathery shell
  part of:  walnut_tree
  subtype:  black_walnut__blackwalnut  American walnut having a very hard and thick woody shell
  subtype:  English_walnut  nut with a wrinkled two-lobed seed and hard but relatively thin shell; widely used in cooking

No statement uses or specializes walnut; click here to add one.