Bestowing rhymes with:
plateauing, toeing, towing, blowing, boeing, bowing, crowing, easygoing, flowing, foregoing, forgoing, glowing, going, growing, hoeing, knowing, lowing, owing, plateauing, rowing, sewing, showing, slowing, snowing, sowing, throwing, toeing, towing, undergoing, unknowing
Bestowing sounds like:
babysitting, backdating, bagdonas, basting, bastions, begetting, besetting, besting, biosystems, boasting, bogdanowicz, bogdanski, boosting, boston's, bostonians, boycotting, busting