THESAURUS
Atoll
ait, archipelago, bar, cay, continental island, coral head, coral island, coral reef, holm, insularity, island, island group, islandology, isle, islet, key, oceanic island, reef, sandbank, sandbar
ROGET THESAURUS
Atoll
Island
N
island, isle, islet, eyot, ait, holf, reef, atoll, breaker, archipelago, islander, insular, seagirt, archipelagic, Fluids in Motion.