yellow lady's slipper, yellow lady-slipper, Cypripedium calceolus, Cypripedium parviflorum
['golf ball', 'platypus, duckbill, duckbilled platypus, duck-billed platypus, Ornithorhynchus anatinus', 'alp', 'chiton, coat-of-mail shell, sea cradle, polyplacophore', 'acorn', 'weevil', 'ping-pong ball']