Stemper rhymes with:
distemper, distemper, temper, distemper, kemper, temper, tremper, bumper, burkemper, camper, damper, distemper, dumper, gamper, hamper, jumper, kamper, kemper, lumper, mumper, pamper, pomper, samper, scamper, shrimper, simper, smokejumper, stamper, stumper, swamper, tamper, temper, thumper, tremper, whimper
Stemper sounds like:
stamper, stanberry, stanbery, stanbury, stanifer, steinbauer, stumper