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

15 letter words

fundamentalists[21]

14 letter words

fundamentalist[20]

12 letter words

fundamentals[18], manifestants[17]

11 letter words

mindfulness[17], fundamental[17], manifestant[16], distasteful[15], instalments[13], andalusites[12]

10 letter words

feudalisms[16], fulminated[16], fundaments[16], manfulness[15], fulminates[15], fantasised[14], uninflated[14], disulfates[14], feudalists[14], infatuated[14], almandines[13], almandites[13], dismantles[13], infestants[13], dentaliums[13], faultiness[13], stimulated[13], infatuates[13], flauntiest[13], instalment[12], mentalists[12], semiannual[12], amanuensis[12], aluminates[12], unmanliest[12], amiantuses[12], stimulates[12], stimulants[12], tantalised[11], unassailed[11], andalusite[11], tantalises[10], sultanates[10], tantaluses[10]

9 letter words

fieldsman[15], feudalism[15], fundament[15], filaments[14], fatalisms[14], manifests[14], flatmates[14], fulminate[14], fulminant[14], sandflies[13], fantailed[13], fantasied[13], steadfast[13], standfast[13], fluidness[13], disulfate[13], feudalist[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], infestant[12], fatalists[12], misstated[12], fantasist[12], fattiness[12], unamassed[12], dentalium[12], simulated[12], influents[12], sulfatase[12], mustelids[12], tumidness[12], unfastens[12], unfitness[12], mutilated[12], ultimated[12], infatuate[12], faultiest[12], fistulate[12], flautists[12], anamnesis[11], manliness[11], laminates[11], stamineal[11], talismans[11], maltiness[11], melanists[11], smaltines[11], staminate[11], mentalist[11], metalists[11], smaltites[11], statesman[11], aluminate[11], simulates[11], simulants[11], matutinal[11], mutilates[11], stimulate[11], ultimates[11], tantalums[11], stimulant[11], nasalised[10], sanitated[10], dilatants[10], disannuls[10], annulated[10], insulated[10], inundates[10], unstained[10], assaulted[10], lassitude[10], sustained[10], adultness[10], dauntless[10], untainted[10], altitudes[10], latitudes[10], unstinted[10], studliest[10], annalists[9], tantalise[9], astatines[9], sanitates[9], taintless[9], nattiness[9], stannites[9], insulates[9], nauseants[9], insulants[9], sultanate[9], auntliest[9], lutanists[9], lutenists[9], nuttiness[9]

8 letter words

inflamed[14], flamines[13], inflames[13], filament[13], fatalism[13], flamiest[13], fenlands[12], inflated[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], melanian[10], linesman[10], melanins[10], malaises[10], amnesias[10], salesman[10], nasalism[10], antimale[10], laminate[10], annelids[9], lindanes[9], assailed[9], dentalia[9], dentinal[9], alanines[8], nasalise[8]