Words That Rhyme With "Happening" :
3 syllables:
battening, blackening, captaining, captioning, cheapening, couponing, dampening, deepening, fattening, flattening, maddening, opening, patenting, ripening, saddening, saponin, slackening
battening, blackening, captaining, captioning, cheapening, couponing, dampening, deepening, fattening, flattening, maddening, opening, patenting, ripening, saddening, saponin, slackening