Prothorax rhymes with:
thorax, thorax, anthrax, feltrax, thorax, votrax, zovirax, alumax, amax, anthrax, apacs, betamax, bodziak's, broadnax, brodnax, cinemax, cossacks, delphax, feltrax, horvac's, ivax, kayaks, kazakhs, kovacs, kovaks, mulanax, mullinax, nasdaq's, novak's, paramax, pasternak's, pedophiliacs, slovaks, thorax, truax, vegisnax, votrax, winamac's, xanax, zovirax
Prothorax sounds like:
porter's, porterages, porters, portrays, predators, pretoria's, puerto-rico