digital clock
['rule, ruler', "plunger, plumber's helper", 'bolo tie, bolo, bola tie, bola', 'horned viper, cerastes, sand viper, horned asp, Cerastes cornutus', 'platypus, duckbill, duckbilled platypus, duck-billed platypus, Ornithorhynchus anatinus', 'whistle', 'howler monkey, howler']