Duper rhymes with:
blooper, cooper, grouper, hooper, kuiper, kuper, kupor, looper, luper, pooper, scooper, stupar, stupor, super, trooper
Duper sounds like:
d'ivoire, d'oeuvre, dadfar, dapper, datapower, dauber, davir, deaver, debarr, debeer, deberry, deboer, debor, debora, deborah, debra, debuhr, deeper, defer, defiore, defoor, defore, defray, depree, deprey, deupree, dever, devera, devere, deveroy, devor, devore, devour, devry, dewberry, dewbre, diaper, dibari, differ, difiore, dipiero, dipierro, dipirro, dipper, diver, dober, dobry, dover, dubarry, dubray, dubree, dubrow, duffer, duffour, dufour, dufur, dupre, dupree, duprey