Feltrax rhymes with:
votrax, anthrax, prothorax, thorax, votrax, zovirax, alumax, amax, anthrax, apacs, betamax, bodziak's, broadnax, brodnax, cinemax, cossacks, delphax, horvac's, ivax, kayaks, kazakhs, kovacs, kovaks, mulanax, mullinax, nasdaq's, novak's, paramax, pasternak's, pedophiliacs, prothorax, slovaks, thorax, truax, vegisnax, votrax, winamac's, xanax, zovirax
Feltrax sounds like:
falters, fielder's, fielders, fieldwork, filters, flathers, floaters, floodwaters, flutters, folders