submarine, pigboat, sub, U-boat
["plane, carpenter's plane, woodworking plane", 'great white shark, white shark, man-eater, man-eating shark, Carcharodon carcharias', 'mobile home, manufactured home', 'washer, automatic washer, washing machine', 'dam, dike, dyke', 'bobsled, bobsleigh, bob', 'pickelhaube']