Backsides rhymes with:
oxides, burnside's, downsides, fratricides, fungicides, genocides, glucosides, herbicides, hillsides, homicides, infanticides, insecticides, ironsides, mountainsides, oxides, pesticides, roadsides, silversides, suicides, whitesides
Backsides sounds like:
backdates, backseats, backstage, backstitch, backstitches, backwoods, baghdad's, baskets, bassists, beachheads, beasts, beckwith's, beefsteak, begets, bequests, besides, best's, bestows, bestwick, bezdek, bigots, biscuits, bisuteki, bisuteki's, boasts, bobcats, boosts, boschwitz, bostic, bostick, bostock, bostwick, bouquets, boycotts, buckets, bustos, busts