Trooper rhymes with:
grouper, blooper, cooper, duper, grouper, hooper, kuiper, kuper, kupor, looper, luper, pooper, scooper, stupar, stupor, super
Trooper sounds like:
tarver, therefore, thurber, torpor, traber, trapper, traver, trefry, treiber, trevor, trifari, tripper