Mismatch rhymes with:
mache, match, matsch, overmatch, rematch, attach, bache, batch, brach, bratsch, catch, detach, dispatch, drach, flach, gach, gatch, hach, hatch, kach, krach, lach, lache, latch, latsch, mache, match, matsch, overmatch, patch, rach, reattach, rematch, scratch, snatch, stach, tatsch, thach, thatch, tkach, unattach, vlach
Mismatch sounds like:
macintax, macintosh, macintosh's, macintoshes, mackintosh, magnates, magnet's, magnetek, magnetic, magnetics, magnets, magnitudes, management's, managements, managements', mankind's, mankinds, massenet's, mccants, mcintosh, mismatches, monsanto's