Sunnyside rhymes with:
cityside, countryside, alcide, backside, bayside, beachside, bedside, blindside, broadside, brookside, burnside, cambridgeside, cityside, countryside, curbside, dioxide, dockside, downside, exide, fireside, fratricide, fungicide, garside, gartside, genocide, germicide, glucoside, glycoside, graveside, harborside, herbicide, hillside, homicide, infanticide, insecticide, ironside, ketcherside, lakeside, mountainside, oceanside, oxide, parkside, peroxide, pesticide, poolside, prophesied, ringside, riverside, roadside, seaside, silverside, southside, suicide, superoxide, underside, wayside, whiteside, woodside
Sunnyside sounds like:
sanctity, schenectady, schuknecht, secessionist, semi-height, sense-data, sensed, singed, sinusoid, skinniest, smacked, smashed, smestad, smoggiest, smoked, smoshed, snacked, snagged, sneaked, sneezed, sonesta, soonest, succinct, sumgait, summonsed, suncoast, sunkist, sunset, sunstate, sunsweet, swimsuit