Lightening rhymes with:
enlightening, brightening, enlightening, frightening, heightening, tightening, battening, brightening, captaining, disheartening, enlightening, fattening, flattening, frightening, heartening, heightening, shortening, smartening, straightening, sweetening, threatening, tightening
Lightening sounds like:
lactating, lasting, legitimacy, legitimize, legitimizes, lightens, lightheadedness, lighting, lighting's, lightness, lightning, lightnings, liquidating, liquidations, listening, listens, listing, listings, locating, locations, lusitania's, lusitanias, lusting