Words That Rhyme With "Mightn't" :

2 syllables:

biden, blatant, briden, brighten, Brighton, chiton, cyton, Dryden, frighten, Haydn, heighten, knighten, latent, Leiden, Leyden, lichen, liden, lighten, liken, mutant, natant, nutant, oughtn't, patent, potent, reiten, riden, rident, righten, ripen, Schleiden, Sidon, statant, Steichen, stipend, strident, tighten, titan, titrant, trident, triton, whiten, widen

3 syllables:

combatant, dilatant, disputant, enlighten, excitant, excitement, incitement, indictment, pollutant, Poseidon, prepotent, renitent, unwhitened, vandyken

4 syllables:

counterpotent, equipotent, idempotent, noncombatant, supernatant, unenlightened