Blowhards rhymes with:
diehards, backyards, bankcards, bodyguards, boulevards, courtyards, datacards, diehards, flashcards, graveyards, hildegardes, junkyards, lifeguards, lumberyards, mastercard's, mastercards, postcards, safecard's, safeguards, scorecards, shipyard's, shipyards, stockyards, sungard's, vanguard's