Brussels, bubble, buckle, bundle, bustle, chuckle, couple, crumble, crumpled, cudgel, double, frontal, fumbled, funnel, grumble, hovel, huddle, humble, hustle, jumble, jungle, knuckle, Lovell, mongrel, muddle, muffled, mumbled, muscle, muzzle, puddle, puzzle, rubble, ruffle, rumble, Russel, Russell, Russell's, rustle, scuffle, shovel, shuffle, shuttle, smuggle, squirrel, struggle, stubble, stumble, subtile, subtle, supple, trouble, Trumbull, tumble, tunnel, uncle

autumnal, disgruntled, rebuttal, redoubled, referral, triumphal, unruffled, untroubled