Smoothing rhymes with:
soothing, bathing, breathing, clothing, farthing, mouthing, scathing, sheathing, soothing, sunbathing, teething, tithing, writhing
Smoothing sounds like:
sanding, sandino's, sandness, scantiness, sending, sentence, sentences, shandong, shantytowns, shunting, smeeting, smoothens, smoothness, something, something's, somethings, sometimes, sondheim's, sounding, soundings, soundness, squinting, sumitomo's, summations, sundance