dam, dike, dyke
['radio telescope, radio reflector', 'lampshade, lamp shade', 'turnstile', 'organ, pipe organ', 'ashcan, trash can, garbage can, wastebin, ash bin, ash-bin, ashbin, dustbin, trash barrel, trash bin', 'seashore, coast, seacoast, sea-coast', 'megalith, megalithic structure']