Comebacks rhymes with:
buybacks, cutbacks, drawbacks, flashbacks, fullbacks, givebacks, greenback's, greenbacks, halfbacks, kickbacks, leasebacks, leatherbacks, paperbacks, paybacks, pricklebacks, pullbacks, quarterbacks, razorback's, razorbacks, rollbacks, setbacks
Comebacks sounds like:
cambex, camby's, camp's, campeau's, campise, campisi, campobasso, campos, camps, camps', campus, campuses, cannabis, canvas, canvases, canvass, canvasses, champoux, champs, chemfix, chimps, combes, combs, comeback, compaq, compaq's, compas, compass, compose, composes, compus, compusa, compusa's, confess, confesses, confucius, confuse, confuses, convex, conveys, convoys, coombes, coombs, cumbias