Nights' rhymes with:
benights, ignites, knight's, knights, night's, nights, reunites, tonight's, unites, benights, bites, bright's, bytes, cites, clevite's, clites, crites, de-excites, delights, excites, feitz, fights, fites, flight's, flights, geitz, grites, heights, heitz, hites, ignites, incites, invites, kites, knight's, knights, light's, lights, lites, mites, night's, nights, nonwhites, overexcites, overwrites, polites, recites, reits, reitz, reunites, rewrites, right's, rights, rights', rite's, rites, seitz, semi-heights, sights, site's, sites, slights, stites, stylites, tights, tonight's, trites, unites, white's, whites, wright's, wrights, writes
Nights' sounds like:
nacogdoches, nasdaq, nasdaq's, nast's, nastasi, naugatuck, necessitates, necessities, neckties, negates, negotiates, nest-egg, nests, newscasts, newsday's, next's, niceties, night's, nighthawk, nighthawks, nights, nonjets, nonstick, nugget's, nuggets