Words That Rhyme With "Happened" :
2 syllables:
bacchant, batten, blacken, blackened, bracken, captioned, cheapened, craton, dampened, deepened, fatten, fattened, flacon, flaten, flatten, flattened, gatten, gladdened, graben, Grattan, gratton, lappen, latten, machen, macken, maddened, opened, paten, patent, Paton, patten, Patton, platan, platen, platten, rabban, rampant, ratton, ripened, saddened, slacken, slackened, staten, steepened, stipend, tappan, weaponed
3 syllables:
combatant, decampment, entrapment, Mountbatten, reopened, unopened