beacon, lighthouse, beacon light, pharos
['chiton, coat-of-mail shell, sea cradle, polyplacophore', 'sea urchin', 'spiny lobster, langouste, rock lobster, crawfish, crayfish, sea crawfish', 'thatch, thatched roof', 'solar dish, solar collector, solar furnace', 'chime, bell, gong', 'switch, electric switch, electrical switch']