Drawbacks rhymes with:
buybacks, comebacks, cutbacks, flashbacks, fullbacks, givebacks, greenback's, greenbacks, halfbacks, kickbacks, leasebacks, leatherbacks, paperbacks, paybacks, pricklebacks, pullbacks, quarterbacks, razorback's, razorbacks, rollbacks, setbacks
Drawbacks sounds like:
darby's, derives, derubeis, dervish, dervishich, diatribes, drabek, drabik, drabs, drapes, dravecky, draves, dravis, dravo's, drawback, drawbaugh, drebsky, dreyfus, dreyfus's, dreyfuss, dribs, dripps, drips, drive's, drives, driveways, drop-offs, dropoffs, drops, dropsy, droves, drupes, dwarfs, dwarves