Sleeper rhymes with:
leeper, leiper, schlieper, beeper, cheaper, deeper, keeper, keiper, kieper, leeper, leiper, neeper, pieper, reaper, scheper, schlieper, steeper, streeper, sweeper, teper
Sleeper sounds like:
scalfaro, scalper, schlafer, schleifer, schlieper, selover, silber, silvar, silveira, silver, silvera, silveri, silveria, silverio, silverware, silvery, slavery, sleepwear, slifer, slipper, slippery, sliver, slobber, sloper, sloppier, slover, solver, sulfur, sulphur