Clapboard rhymes with:
chipboard, clipboard, mopboard, shipboard, aboveboard, baseboard, billboard, blackboard, cardboard, checkerboard, chessboard, chipboard, clipboard, containerboard, dartboard, dashboard, fiberboard, fibreboard, fingerboard, floorboard, hardboard, headboard, inboard, keyboard, linerboard, mopboard, onboard, outboard, overboard, paperboard, pegboard, plasterboard, pressboard, scoreboard, seaboard, shipboard, skateboard, smorgasbord, snowboard, springboard, storyboard, surfboard, switchboard, wallboard, washboard
Clapboard sounds like:
calbert, calibrate, calibrated, calvert, celebrate, celebrated, celebrity, ciliberto, clifford, clipboard, clippard, clobbered, colbert, colebreath, colford, collaborate, collaborated, colvard, colvert, culbert, culbreath, culbreth, culprit, culvert