Worldwide's rhymes with:
allied's, azides, backsides, bromides, burnside's, carbide's, certified's, downsides, fluorides, fratricides, fungicides, genocides, glucosides, herbicides, hillsides, homicides, infanticides, insecticides, iodide's, iodides, ironsides, landslides, mountainsides, overrides, oxides, peptides, pesticides, polysaccharides, roadsides, silversides, suicides, tellurides, thalidomide's, triglycerides, whitesides