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From letters F, R, A, C, T, I, O, U, S, N, E, S, S, E, S  I made following words

15 letter words

fractiousnesses[20]

14 letter words

factiousnesses[19]

13 letter words

facetiousness[18], fractiousness[18]

12 letter words

craftinesses[17], factiousness[17], frostinesses[15], crustinesses[14]

11 letter words

firstnesses[14], fustinesses[14], scarinesses[13], resistances[13], antecessors[13], saucinesses[13], narcissuses[13], auctioneers[13], necessitous[13], artsinesses[11], seriousness[11], rustinesses[11]

10 letter words

fricassees[15], interfaces[15], fornicates[15], refections[15], craftiness[15], foscarnets[15], frescoists[15], refocusses[15], cofeatures[15], furcations[15], confitures[15], fairnesses[13], firestones[13], frostiness[13], fastnesses[13], softnesses[13], unsafeties[13], interfuses[13], transfuses[13], racinesses[12], coarseness[12], recessions[12], cosinesses[12], secessions[12], ancestries[12], resistance[12], antecessor[12], resections[12], secretions[12], cessations[12], ancestress[12], scenarists[12], ostracises[12], croissants[12], auctioneer[12], centauries[12], cautioners[12], cointreaus[12], recautions[12], courtesies[12], courtesans[12], suctorians[12], countesses[12], cerussites[12], curtnesses[12], crustiness[12], rosinesses[10], artinesses[10], assertions[10], sournesses[10], sustainers[10], unstresses[10]

9 letter words

fricassee[14], forensics[14], confesses[14], interface[14], fornicate[14], refection[14], frenetics[14], infecters[14], reinfects[14], factories[14], foscarnet[14], fractions[14], infectors[14], forecasts[14], frescoist[14], refocuses[14], cofeature[14], furcation[14], confiture[14], infuscate[14], facetious[14], outfences[14], rufescent[14], farnesses[12], sanserifs[12], firestone[12], fasteners[12], refastens[12], infesters[12], seafronts[12], resoftens[12], softeners[12], fatnesses[12], fitnesses[12], firstness[12], nefarious[12], reinfuses[12], furanoses[12], fussiness[12], increases[11], scenarios[11], recession[11], secession[11], ancresses[11], scariness[11], incrosses[11], crassness[11], crossness[11], centiares[11], cisternae[11], creatines[11], iterances[11], nectaries[11], esoterica[11], carotenes[11], actioners[11], anoretics[11], creations[11], reactions[11], erections[11], neoterics[11], resection[11], secretion[11], cineastes[11], notecases[11], canoeists[11], cessation[11], sonicates[11], seicentos[11], creasiest[11], sectaries[11], reascents[11], sarcenets[11], canisters[11], scenarist[11], secretins[11], sincerest[11], ostracise[11], ancestors[11], croissant[11], ecstasies[11], contessas[11], actresses[11], crossties[11], coassists[11], cinereous[11], causeries[11], sinecures[11], sericeous[11], coinsures[11], issuances[11], sauciness[11], surceases[11], cuirasses[11], narcissus[11], uncrosses[11], scissures[11], autocrine[11], cautioner[11], cointreau[11], recaution[11], tenacious[11], cauteries[11], uncreates[11], truancies[11], reseasons[9], seasoners[9], arsenites[9], irateness[9], resinates[9], stearines[9], teariness[9], earstones[9], resonates[9], assertion[9], senoritas[9], serotines[9], essonites[9], assenters[9], sarsenets[9], artsiness[9], assentors[9], starnoses[9], arsonists[9], assisters[9], assistors[9], arsenious[9], ossuaries[9]