submarine, pigboat, sub, U-boat
['chain mail, ring mail, mail, chain armor, chain armour, ring armor, ring armour', 'bow', 'crane', 'hippopotamus, hippo, river horse, Hippopotamus amphibius', 'streetcar, tram, tramcar, trolley, trolley car', 'killer whale, killer, orca, grampus, sea wolf, Orcinus orca', 'jellyfish']