Downsides rhymes with:
burnside's, ironsides, mountainsides, backsides, burnside's, fratricides, fungicides, genocides, glucosides, herbicides, hillsides, homicides, infanticides, insecticides, ironsides, mountainsides, oxides, pesticides, roadsides, silversides, suicides, whitesides
Downsides sounds like:
denktas, densities, domestic, domestics, donizetti's, downstage, dynastic, dynasties