submarine, pigboat, sub, U-boat
['sunscreen, sunblock, sun blocker', 'stingray', 'bobsled, bobsleigh, bob', 'chain mail, ring mail, mail, chain armor, chain armour, ring armor, ring armour', 'crayfish, crawfish, crawdad, crawdaddy', 'tiger shark, Galeocerdo cuvieri', 'safe']