Lighten rhymes with:
enlighten, litan, breighton, brighten, brighton, criton, enlighten, frighten, guyton, heighten, iten, knighten, knighton, litan, reitan, reiten, tighten, titan, triton, whiten
Lighten sounds like:
lactation, lactone, laughton, laxton, lecithin, leichtman, leighton, lewiston, lichten, lichtman, ligation, liquidation, listen, liston, location, lockdown, logsdon, logston, lusitania, luxton