Words That Rhyme With "Smoothen" :
2 syllables:
boozing, bruising, choosing, cruising, fusing, grooving, losing, musing, oozing, proving, Pugin, sleuthing, snoozing, soothing, toothing, using
3 syllables:
abusing, accusing, amusing, approving, confusing, defusing, diffusing, disproven, excusing, improving, infusing, misusing, perusing, recusing, refusing, reproving, reusing, suffusing