Happen rhymes with:
lappen, tappan, tappen, alagappan, aspen, campen, capen, cheapen, compean, copen, crippen, crispen, dampen, deepen, deppen, eappen, flippen, hempen, hippen, kampen, karpen, kempen, koeppen, koppen, lappen, lupin, mcalpin, misshapen, open, phippen, pippen, poppen, reopen, ripen, rippon, saipan, sharpen, stepan, supan, tappan, tappen, tarpon, thigpen, thomspon, tippen, turpen, vancampen, vankampen, weapon, yaupon, zupan
Happen sounds like:
habben, hafeman, hafen, hafnia, hafnium, hapeman, havana, haveman, havemann, haven, havin', heaven, heavin, hibben, hibma, hipbone, hippen, hoban, hoben, hobin, hoffman, hoffmann, hofman, hofmann, hooven, hopman, hovan, hoven, hovnanian, huffine, huffman, hyphen