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

15 letter words

futilitarianism[20]

14 letter words

utilitarianism[16]

13 letter words

futilitarians[16], antiritualism[15]

12 letter words

futilitarian[15], utilitarians[12]

11 letter words

miniaturist[13], utilitarian[11]

10 letter words

unfamiliar[15], initialism[12], militarist[12], luminarias[12], sanitarium[12], naturalism[12], naturalist[10]

9 letter words

familiars[14], trainfuls[12], ultrafast[12], miliarias[11], militaria[11], animalist[11], laminitis[11], animatist[11], militants[11], tarantism[11], luminaria[11], unsimilar[11], ritualism[11], matutinal[11], titaniums[11], tantalums[11], stimulant[11], ritualist[9]

8 letter words

familiar[13], finalism[13], fatalism[13], raftsman[13], filarian[11], fantails[11], tailfans[11], finalist[11], tailfins[11], airlifts[11], fatalist[11], unifilar[11], trainful[11], fistular[11], flautist[11], tristful[11], miliaria[10], mainsail[10], airmails[10], militias[10], staminal[10], talisman[10], alarmist[10], mistrial[10], martians[10], tamarins[10], martinis[10], mistrain[10], militant[10], titanism[10], intimist[10], tantrism[10], transmit[10], manurial[10], aluminas[10], minutial[10], amiantus[10], simulant[10], luminist[10], timaraus[10], tiramisu[10], altruism[10], muralist[10], ultraism[10], natriums[10], naturism[10], ultimata[10], titanium[10], tantalum[10], antismut[10], striatum[10], tritiums[10], tantrums[10], initials[8], intarsia[8], titanias[8], rattails[8], silurian[8], naturals[8], rutilant[8], tantalus[8], lutanist[8], altruist[8], titulars[8], ultraist[8], saturant[8], antirust[8], naturist[8]

7 letter words

firmans[12], infirms[12], liftman[12], fantasm[12], maftirs[12], armfuls[12], armsful[12], fulmars[12], surfman[12], turfman[12], filaria[10], finalis[10], finials[10], farinas[10], fantail[10], tailfan[10], tailfin[10], airlift[10], antifat[10], fantast[10], fusaria[10], antiflu[10], antifur[10], flautas[10], fistula[10], airmail[9], laminar[9], animals[9], laminas[9], manilas[9], mislain[9], similar[9], marinas[9], marlins[9], militia[9], matinal[9], intimal[9], marital[9], martial[9], martian[9], tamarin[9], martini[9], stamina[9], animist[9], intimas[9], santimi[9], amritas[9], tamaris[9], simitar[9], mistral[9], ramtils[9], mantras[9], martins[9], tatamis[9], mattins[9], alumina[9], ruminal[9], manuals[9], alumins[9], samurai[9], alarums[9], simular[9], uranism[9], minutia[9], timarau[9], natrium[9], ultimas[9], stimuli[9], initial[7], antiair[7], latinas[7], lariats[7], latrias[7], antiars[7], artisan[7], tsarina[7], ratlins[7], nitrils[7], titania[7], rattail[7], attains[7], titians[7], saltant[7], lattins[7], striata[7], stratal[7], starlit[7], rattans[7], tantras[7], tartans[7], transit[7], anurias[7], saurian[7], uranias[7], ranulas[7], insular[7], urinals[7], nautili[7], natural[7]