The Collaborative International Dictionary of English v.0.48:

Mishmash \Mish"mash`\, n. [Cf. G. mish-mash, fr. mischen to
   mix.]
   A hodgepodge or hotchpotch; a confused jumble. [Also spelled
   mishmosh.] --Sir T. Herbert.
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

mishmash
    n 1: a motley assortment of things [syn: odds and ends,
         oddments, melange, farrago, ragbag, mishmash,
         mingle-mangle, hodgepodge, hotchpotch, gallimaufry,
         omnium-gatherum]

Moby Thesaurus II by Grady Ward, 1.0:

54 Moby Thesaurus words for "mishmash":
   all sorts, arsy-varsiness, assemblage, assortment, broad spectrum,
   clutter, conglomeration, farrago, gallimaufry, goulash, hash,
   helter-skelter, higgledy-piggledy, hodgepodge, hotchpot,
   hotchpotch, hysteron proteron, jumble, jungle, litter, magpie,
   mash, medley, melange, mess, mingle-mangle, miscellany, mix,
   mixed bag, mixture, muddle, odds and ends, olio, olla podrida,
   omnium gatherum, omnium-gatherum, pasticcio, pastiche, patchwork,
   potpourri, rummage, salad, salmagundi, sauce, scramble, stew,
   tangle, topsy-turviness, topsy-turvydom, tumble, turmoil,
   unholy mess, welter, what you will