Tighten rhymes with:
titan, breighton, brighten, brighton, criton, enlighten, frighten, guyton, heighten, iten, knighten, knighton, lighten, litan, reitan, reiten, titan, triton, whiten
Tighten sounds like:
tajikistan, taketomi, taxation, techsystem, testimony, teston, thackston, thaxton, tjaden, touchdown, touchstone, touchton, tsutomu, tustin