hippopotamus, hippo, river horse, Hippopotamus amphibius
['puffer, pufferfish, blowfish, globefish', 'axolotl, mud puppy, Ambystoma mexicanum', 'black stork, Ciconia nigra', 'seashore, coast, seacoast, sea-coast', 'ear, spike, capitulum', 'sea snake', 'submarine, pigboat, sub, U-boat']