Windfalls rhymes with:
pitfalls, pratfalls, rainfalls, shortfalls, waterfalls, basketball's, basketballs, butterballs, catcalls, coveralls, eyeballs, fastballs, fireballs, football's, footballs, handballs, marshalls, meatballs, mothballs, neanderthals, newhall's, oddballs, overalls, overhauls, pitfalls, pratfalls, protocols, rainfalls, recalls, shortfalls, snowball's, snowballs, softballs, spaceballs, spitball's, thiokol's, trackballs, warhol's, waterfalls, whitehall's