Frighten rhymes with:
breighton, brighten, brighton, criton, reitan, reiten, triton, breighton, brighten, brighton, criton, enlighten, guyton, heighten, iten, knighten, knighton, lighten, litan, reitan, reiten, tighten, titan, triton, whiten
Frighten sounds like:
fabrication, feuerstein, fierstein, firestine, firestone, forgotten, forstmann, fraction, freestone, freston, friction, fruchtman