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

15 letter words

facetiousnesses[20]

14 letter words

factiousnesses[19]

13 letter words

facetiousness[18]

12 letter words

factiousness[17]

11 letter words

fustinesses[14], saucinesses[13], acutenesses[13], necessitous[13]

10 letter words

safenesses[13], fastnesses[13], softnesses[13], unsafeties[13], cosinesses[12], secessions[12], cessations[12], cutenesses[12], countesses[12], easinesses[10]

9 letter words

confesses[14], infuscate[14], facetious[14], outfences[14], fatnesses[12], fitnesses[12], fussiness[12], fustiness[12], secession[11], cineastes[11], notecases[11], canoeists[11], cessation[11], sonicates[11], seicentos[11], ecstasies[11], contessas[11], coassists[11], issuances[11], sauciness[11], tenacious[11], eustacies[11], acuteness[11], setaceous[11], caestuses[11], suitcases[11], seascouts[11], essonites[9], uneasiest[9], eustasies[9]

8 letter words

faiences[13], fiancees[13], casefies[13], fascines[13], fiascoes[13], fanciest[13], factions[13], fascists[13], unifaces[13], confuses[13], focusses[13], outfence[13], outfaces[13], factious[13], confutes[13], safeness[11], finesses[11], safeties[11], fastness[11], softness[11], fustians[11], foetuses[11], fussiest[11], senecios[10], ecesises[10], cassenes[10], essences[10], cassines[10], caseoses[10], caissons[10], cassinos[10], cessions[10], cosiness[10], cassises[10], cineaste[10], acetones[10], notecase[10], aconites[10], canoeist[10], sonicate[10], seicento[10], centeses[10], cineasts[10], scanties[10], centesis[10], coesites[10], contessa[10], sections[10], coassist[10], consists[10], eucaines[10], issuance[10], censuses[10], auctions[10], cautions[10], counties[10], sauciest[10], suitcase[10], nutcases[10], cuteness[10], seascout[10], coituses[10], contuses[10], countess[10], suctions[10], cestuses[10], casuists[10], cistuses[10], easiness[8], enosises[8], noesises[8], sessions[8], etesians[8], teniases[8], astonies[8], essonite[8], sensates[8], sestinas[8], sestines[8], stenoses[8], sonsiest[8], stenosis[8], sassiest[8], suasions[8], sinuates[8], soutanes[8], sustains[8], tussises[8]

7 letter words

faience[12], fiancee[12], enfaces[12], fancies[12], fascine[12], fiances[12], fiascos[12], confess[12], faction[12], infects[12], confits[12], fascist[12], finesse[10], fainest[10], acinose[9], senecio[9], cassene[9], encases[9], seances[9], senecas[9], essence[9], caseins[9], cassine[9], incases[9], caseose[9], caisson[9], casinos[9], cassino[9], cession[9], cosines[9], oscines[9], asceses[9], ascesis[9], acetone[9], aconite[9], cetanes[9], tenaces[9], acetins[9], cineast[9], entices[9], acetose[9], coatees[9], coesite[9], octanes[9], cenotes[9], actions[9], atonics[9], cations[9], notices[9], section[9], ectases[9], ascites[9], ectasis[9], eosines[7], sanseis[7], senseis[7], seasons[7], essoins[7], osseins[7], session[7], sassies[7], etesian[7], atonies[7], easiest[7]