submarine, pigboat, sub, U-boat
['bucket, pail', 'sturgeon', 'puck, hockey puck', 'gas pump, gasoline pump, petrol pump, island dispenser', 'electric ray, crampfish, numbfish, torpedo', 'ice bear, polar bear, Ursus Maritimus, Thalarctos maritimus', 'gar, garfish, garpike, billfish, Lepisosteus osseus']