珊瑚[sango] coral
珊瑚礁[sangoshou] coral reef
脳珊瑚[nousango] brain coral
珊瑚海[sangokai] Coral Sea
管珊瑚[kudasango] organ-pipe coral

赤珊瑚[akasango] red coral (Corallium japonicum)
珊瑚水木[sangomizuki] Cornus alba
珊瑚樹[sangoju] Viburnum odoratissimum
珊瑚蛇[sangohebi] coral snake
床板珊瑚[shoubansango] tabulate coral (extinct coral of the order Tabulata)