Thickened rhymes with:
chickened, quickened, sickened, arcand, awakened, beckoned, blackened, chickened, darkened, likened, millisecond, nanosecond, quickened, reawakened, reckoned, second, sickened, slackened, weakened
Thickened sounds like:
taekwondo, tagamet, takemoto, tashkent, techint, thousand, thousandth, toughened, tousignant, toussaint, tsukamoto