Bumper rhymes with:
dumper, jumper, lumper, mumper, stumper, thumper, burkemper, camper, damper, distemper, dumper, gamper, hamper, jumper, kamper, kemper, lumper, mumper, pamper, pomper, samper, scamper, shrimper, simper, smokejumper, stamper, stemper, stumper, swamper, tamper, temper, thumper, tremper, whimper
Bumper sounds like:
bamber, banbury, bembry, benfer, bomber, bonfire