Doppler rhymes with:
poplar, coupler, epler, eppler, hepler, heppler, hippler, kappler, kempler, kepler, keppler, krempler, oppler, peppler, poplar, sampler, shepler, stempler, templar, wampler, weppler
Doppler sounds like:
defleur, deibler, deplore, deubler, devillier, dievler, dobler, doebler, dubilier, dupler, duvalier