Opaque rhymes with:
paik, pake, spake, ache, ake, awake, bake, betake, blake, brake, break, cake, dake, drake, fake, flake, forsake, haik, hake, jacque, jake, lake, make, mistake, naik, paik, pake, partake, plake, quake, rake, remake, retake, sake, schake, schlake, schnake, schwake, shaik, shaikh, shake, shrake, snake, spake, stake, steak, take, wake, yake
Opaque sounds like:
obese, obeys, obsequious, obsess, obsesses, obuchowski, obvious, ofc, off's, office, office's, offices, officio, offs, ohbayashi, oops, op's, opax, opec, opec's, opic, opic's, oppose, opposes, ops, opus, ovex