Dumper rhymes with:
bumper, jumper, lumper, mumper, stumper, thumper, bumper, burkemper, camper, damper, distemper, gamper, hamper, jumper, kamper, kemper, lumper, mumper, pamper, pomper, samper, scamper, shrimper, simper, smokejumper, stamper, stemper, stumper, swamper, tamper, temper, thumper, tremper, whimper
Dumper sounds like:
dambra, damper, dampier, danbury, denboer, denver, dimambro, dimperio, donapria, donofrio, downpour, dudenhoeffer, dumber, dunbar