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From letters F, A, I, T, H, L, E, S, S, N, E, S, S, E, S  I made following words

15 letter words

faithlessnesses[21]

13 letter words

selfishnesses[19], faithlessness[19], shiftlessness[19]

12 letter words

flashinesses[18], fleshinesses[18]

11 letter words

selfishness[17], heftinesses[17], leafinesses[14], falsenesses[14], lithenesses[14], hastinesses[14], stalenesses[11], saltinesses[11], slatinesses[11], stainlesses[11]

10 letter words

halfnesses[16], flashiness[16], fleshiness[16], halenesses[13], safenesses[13], ashinesses[13], selfnesses[13], flatnesses[13], esthesises[13], fastnesses[13], easinesses[10], latenesses[10], essentials[10], litenesses[10], steeliness[10], saltnesses[10]

9 letter words

shinleafs[15], faithless[15], flashiest[15], fleshiest[15], heftiness[15], shiftless[15], leafiness[12], falseness[12], asthenies[12], sheeniest[12], fleetness[12], natheless[12], litheness[12], esthesias[12], feastless[12], sheetless[12], fatnesses[12], fitnesses[12], hastiness[12], senseless[9], sassiness[9], selenates[9], essential[9], enlistees[9], selenites[9], staleness[9], saltiness[9], slatiness[9], stainless[9], assetless[9]

8 letter words

shinleaf[14], halfness[14], fishless[14], fetishes[14], fishnets[14], sheenies[11], haleness[11], safeness[11], sneeshes[11], finesses[11], ashiness[11], hessians[11], selfness[11], sashless[11], fealties[11], fetiales[11], leafiest[11], inflates[11], theelins[11], safeties[11], esthesia[11], feetless[11], heatless[11], sealifts[11], felsites[11], heliasts[11], shaliest[11], shelties[11], antheses[11], anthesis[11], shanties[11], sheitans[11], sthenias[11], flatness[11], nathless[11], estheses[11], esthesis[11], hessites[11], shitless[11], fastness[11], alienees[8], easiness[8], assesses[8], selenate[8], enlistee[8], selenite[8], steelies[8], etesians[8], teniases[8], lateness[8], elastins[8], nailsets[8], salients[8], saltines[8], liteness[8], setlines[8], seatless[8], sensates[8], sestinas[8], sestines[8], saltness[8], sassiest[8]

7 letter words

flashes[13], fleshes[13], hisself[13], selfish[13], leftish[13], fishnet[13], sheenie[10], finales[10], felines[10], inhales[10], feeless[10], leashes[10], falsies[10], sheilas[10], finesse[10], hessian[10], flenses[10], hansels[10], finless[10], lashins[10], ashless[10], hassels[10], hassles[10], slashes[10], snashes[10], lethean[10], inflate[10], theelin[10], fetials[10], sealift[10], felsite[10], lefties[10], liefest[10], halites[10], heliast[10], sheltie[10], ethanes[10], ethenes[10], fainest[10], sheitan[10], sthenia[10], theines[10], hantles[10], seethes[10], alienee[7], salines[7], silanes[7], enisles[7], ensiles[7], seniles[7], lessees[7], lassies[7], sessile[7], sanseis[7], senseis[7], lessens[7], sinless[7], sassies[7], lineate[7], eeliest[7], steelie[7], etesian[7], lateens[7], leanest[7], stelene[7], elastin[7], entails[7], nailset[7], salient[7], saltine[7], slainte[7], tenails[7], lenites[7], lisente[7], setline[7], tensile[7]