umbel mubel ubmel bumel mbuel bmuel umebl muebl uembl eumbl meubl emubl ubeml bueml uebml eubml beuml ebuml mbeul bmeul mebul embul bemul ebmul umble muble ubmle bumle mbule bmule umlbe mulbe ulmbe lumbe mlube lmube ublme bulme ulbme lubme blume lbume mblue bmlue mlbue lmbue blmue lbmue umelb muelb uemlb eumlb meulb emulb umleb muleb ulmeb lumeb mlueb lmueb uelmb eulmb ulemb luemb elumb leumb melub emlub mleub lmeub elmub lemub ubelm buelm ueblm eublm beulm ebulm ublem bulem ulbem lubem bluem lbuem uelbm eulbm ulebm luebm elubm leubm belum eblum bleum lbeum elbum lebum mbelu bmelu meblu emblu bemlu ebmlu mbleu bmleu mlbeu lmbeu blmeu lbmeu melbu emlbu mlebu lmebu elmbu lembu belmu eblmu blemu lbemu elbmu lebmu
Note: these 'words' (valid or invalid) are all the permutations of the word umbel. These words are obtained by scrambling the letters in umbel.