Flatbed rhymes with:
hotbed, deathbed, featherbed, hotbed, riverbed, seabed, waterbed, aforesaid, airhead, anstead, armested, armistead, armstead, arrowhead, bankhead, beachhead, beckstead, bedspread, blockhead, bloodshed, bobsled, braindead, breastfed, bridgehead, broadhead, brodhead, bulkhead, bullhead, bumstead, butthead, cadenhead, christiansted, cityfed, coed, comfed, copperhead, cornbread, craghead, craighead, deadhead, deathbed, delmed, dragonhead, drumhead, duramed, egghead, englbred, farmstead, featherbed, figurehead, firstfed, flathead, gingerbread, glenfed, godhead, goodbread, grinstead, hampstead, hardhead, hollingshead, hollinshead, hollyhead, holstead, homefed, homestead, horsehead, hotbed, inbred, lawhead, letterhead, lochhead, loggerhead, marblehead, masthead, milstead, moorehead, moorhead, moosehead, mothershead, mothershed, muirhead, newlywed, olmstead, ounsted, redhead, riverbed, riverhead, roundhead, scimed, seabed, shithead, skinhead, spearhead, springstead, steelhead, sudafed, thickhead, trailhead, travelstead, umstead, unionfed, warhead, waterbed, watershed, weatherhead, wellhead, westfed, whitbread, whitebread, whitehead, winstead, woodhead, woodshed