coral reef

noun 0.739

reef

noun 0.707

barrier

noun 0.693

fringing reef

noun 0.672

coral island

noun 0.604

ice barrier

noun 0.588

breakwater

noun 0.563

barricade

noun 0.550

coral

noun 0.548

tariff barrier

noun 0.543

barrer

noun 0.540

seawall

noun 0.529

reef knot

noun 0.523

sandbar

noun 0.516

buffer zone

noun 0.516

brain coral

noun 0.516

atoll

noun 0.505

language barrier

noun 0.502

sound barrier

noun 0.502