Letterhead rhymes with:
copperhead, figurehead, loggerhead, riverhead, weatherhead, airhead, arrowhead, bankhead, beachhead, blockhead, bridgehead, broadhead, brodhead, bulkhead, bullhead, butthead, cadenhead, copperhead, craghead, craighead, deadhead, dragonhead, drumhead, egghead, figurehead, flathead, godhead, hardhead, hollingshead, hollinshead, hollyhead, horsehead, lawhead, lochhead, loggerhead, marblehead, masthead, moorehead, moorhead, moosehead, mothershead, muirhead, redhead, riverhead, roundhead, shithead, skinhead, spearhead, steelhead, thickhead, trailhead, warhead, weatherhead, wellhead, whitehead, woodhead
Letterhead sounds like:
latourette, leatherwood, ledyard, leotard, letarte, lettered, literate, literati, littered