flatworm, platyhelminth
['ballpoint, ballpoint pen, ballpen, Biro', 'echidna, spiny anteater, anteater', 'sidewinder, horned rattlesnake, Crotalus cerastes', 'loggerhead, loggerhead turtle, Caretta caretta', 'nipple', 'lycaenid, lycaenid butterfly', 'sandbar, sand bar']