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From letters F, U, N, D, A, M, E, N, T, A, L, I, S, M, S  I made following words

15 letter words

fundamentalisms[23]

14 letter words

fundamentalism[22]

12 letter words

fundamentals[18]

11 letter words

mindfulness[17], fundamental[17], multimanned[16], andalusites[12]

10 letter words

feudalisms[16], fulminated[16], fundaments[16], maenadisms[15], mandamuses[15], manfulness[15], fulminates[15], talmudisms[15], fantasised[14], mentalisms[14], uninflated[14], disulfates[14], feudalists[14], almandines[13], almandites[13], dismantles[13], dentaliums[13], faultiness[13], semiannual[12], amanuensis[12], aluminates[12], unmanliest[12], amiantuses[12], unassailed[11], andalusite[11]

9 letter words

fieldsman[15], feudalism[15], fundament[15], maenadism[14], filaments[14], fatalisms[14], manifests[14], fulminate[14], fulminant[14], talmudism[14], sandflies[13], melanisms[13], fantailed[13], melismata[13], fantasied[13], mentalism[13], amassment[13], mainmasts[13], fluidness[13], minuteman[13], disulfate[13], feudalist[13], malamutes[13], malemiuts[13], muniments[13], slummiest[13], almandine[12], mainlands[12], almandite[12], laminated[12], diamantes[12], dismantle[12], faineants[12], adamsites[12], diastemas[12], dismalest[12], medalists[12], fantasies[12], fantasise[12], fatalness[12], faintness[12], unamassed[12], dentalium[12], simulated[12], influents[12], sulfatase[12], mustelids[12], tumidness[12], unfastens[12], unfitness[12], anamnesis[11], manliness[11], laminates[11], stamineal[11], talismans[11], maltiness[11], melanists[11], smaltines[11], aluminate[11], simulates[11], simulants[11], nasalised[10], disannuls[10], annulated[10], insulated[10], inundates[10], unstained[10], assaulted[10], lassitude[10], sustained[10], adultness[10], dauntless[10], annalists[9], insulates[9], nauseants[9], insulants[9]

8 letter words

inflamed[14], dilemmas[13], flamines[13], inflames[13], misnamed[13], filament[13], fatalism[13], flamiest[13], mismated[13], manifest[13], filmsets[13], leftisms[13], melanism[12], fenlands[12], melismas[12], misnames[12], inflated[12], immanent[12], imamates[12], malmiest[12], mainmast[12], mismates[12], stammels[12], slimmest[12], daftness[12], amandine[11], mainland[11], maladies[11], dalesman[11], leadsman[11], landsman[11], landsmen[11], amidases[11], misdeals[11], misleads[11], landmass[11], mildness[11], mindless[11], animated[11], diamante[11], faineant[11], adamsite[11], diastema[11], matildas[11], medalist[11], misdealt[11], fantasie[11], fantails[11], tailfans[11], inflates[11], mandates[11], mediants[11], infantas[11], infantes[11], sealifts[11], diastems[11], misdates[11], melanian[10], linesman[10], melanins[10], malaises[10], amnesias[10], salesman[10], nasalism[10], antimale[10], laminate[10], amentias[10], animates[10], talesman[10], staminal[10], talisman[10], ailments[10], aliments[10], manliest[10], melanist[10], smaltine[10], mannites[10], maltases[10], annelids[9], lindanes[9], assailed[9], dentalia[9], dentinal[9], andantes[9], diastase[9], destains[9], sandiest[9], alanines[8], nasalise[8], annalist[8], entasias[8], sealants[8]