Words That Rhyme With "Smoothing" :
2 syllables:
bathing, boozing, breathing, bruising, choosing, clothing, cruising, fusing, grooving, losing, luging, musing, oozing, proving, scathing, sheathing, sleuthing, snoozing, soothing, southing, swathing, teething, tithing, toothing, trithing, using, writhing
3 syllables:
abusing, accusing, amusing, approving, confusing, defusing, diffusing, disproven, excusing, improving, infusing, misusing, perusing, recusing, refusing, reproving, reusing, suffusing