Coupler rhymes with:
doppler, epler, eppler, hepler, heppler, hippler, kappler, kempler, kepler, keppler, krempler, oppler, peppler, poplar, sampler, shepler, stempler, templar, wampler, weppler
Coupler sounds like:
caballero, cabler, capillary, cavalier, cavaliere, cavalieri, cavallaro, cavallero, cavalry, chappelear, chevalier, chivalry, cobbler, cobler, cuvelier