submarine, pigboat, sub, U-boat
['lumbermill, sawmill', 'killer whale, killer, orca, grampus, sea wolf, Orcinus orca', 'vacuum, vacuum cleaner', 'bathtub, bathing tub, bath, tub', 'maillot, tank suit', 'police van, police wagon, paddy wagon, patrol wagon, wagon, black Maria', 'yawl']