Horizon's rhymes with:
horizons, horizons, fisons, horizons, arkansans, artisans, citizen's, citizens, citizens', cousin's, cousins, couzens, cozzens, denizens, dozens, fisons, gazans, horizons, imprisons, kansan's, kansans, kansans', partisans, poisons, prison's, prisons, raisins, reasons, resins, rosen's, season's, seasons, susan's, telxon's
Horizon's sounds like:
harassing, hargens, harkin's, harking, harkins, harkness, harrison's, harshness, hearkens, herzing, hirosakamoki, hoarseness, horizons, horsham's, horsing, hurricane's, hurricanes