THESAURUS
coral reef
ait, archipelago, atoll, bank, bar, bill, breakwater, cape, cay, chersonese, continental island, coral head, coral island, delta, flat, ford, foreland, head, headland, holm, hook, insularity, island, island group, islandology, isle, islet, key, mull, naze, ness, oceanic island, peninsula, point, promontory, reef, sandbank, sandbar, sandspit, shallow, shallows, shelf, shoal, shoal water, spit, spur, tidal flats, tongue, wetlands
ROGET THESAURUS
coral reef
Pitfall
N
pitfall, rocks, reefs,
coral reef, sunken rocks, snags, sands, quicksands, syrt, syrtis, Goodwin sands, sandy foundation, slippery ground, breakers, shoals, shallows, bank, shelf, flat, lee shore, ironbound coast, rock ahead, breakers ahead, precipice, maelstrom, volcano, ambush, pitfall, trapdoor, trap, sword of Damocles, wolf at the door, snake in the grass, death in the pot, latency, ugly customer, dangerous person, le chat qui dort, firebrand, hornet's nest, latet anquis in herba, proximus ardet Ucalegon.