snorkel
['breakwater, groin, groyne, mole, bulwark, seawall, jetty', 'anemone fish', 'ballpoint, ballpoint pen, ballpen, Biro', 'buckle', 'great white shark, white shark, man-eater, man-eating shark, Carcharodon carcharias', 'binoculars, field glasses, opera glasses', 'hourglass']