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

15 letter words

ferociousnesses[20]

13 letter words

ferociousness[18]

11 letter words

seriousness[11]

10 letter words

fierceness[15], confessors[15], coniferous[15], refocusses[15], rifenesses[13], recessions[12], cosinesses[12], secessions[12], esuriences[12], censorious[12], secureness[12], sorenesses[10], rosinesses[10], enuresises[10], surenesses[10], sournesses[10]

9 letter words

conferees[14], forensics[14], confessor[14], confesses[14], ferocious[14], refocuses[14], reinfuses[12], fussiness[12], sceneries[11], recession[11], secession[11], incrosses[11], crossness[11], esurience[11], cinereous[11], sinecures[11], sericeous[11], coinsures[11], uncrosses[11], scissures[11], sorosises[9]

8 letter words

conferee[13], refences[13], enforces[13], coinfers[13], conifers[13], forensic[13], fornices[13], frescoes[13], frounces[13], confuses[13], focusers[13], focusses[13], foreseen[11], freeness[11], rifeness[11], foresees[11], finesses[11], frissons[11], reinfuse[11], infusers[11], sunroofs[11], fissures[11], senecios[10], conioses[10], necroses[10], necrosis[10], ecesises[10], essences[10], cessions[10], cosiness[10], recesses[10], scissors[10], insecure[10], sinecure[10], coenures[10], coinsure[10], corneous[10], cereuses[10], censures[10], cornuses[10], censuses[10], scissure[10], sucroses[10], eeriness[8], eserines[8], erosions[8], enosises[8], noesises[8], soreness[8], rosiness[8], sessions[8], enureses[8], enuresis[8], neuroses[8], neurosis[8], resinous[8], rosinous[8], reissues[8], seisures[8], sureness[8], sunrises[8], sourness[8]

7 letter words

refence[12], enforce[12], coinfer[12], conifer[12], fencers[12], confers[12], confess[12], sferics[12], frescos[12], frounce[12], confuse[12], focuser[12], refocus[12], fescues[12], ficuses[12], focuses[12], fucoses[12], refines[10], foresee[10], roofies[10], finesse[10], foisons[10], frisees[10], enserfs[10], frisson[10], unfrees[10], infuser[10], furioso[10], sunroof[10], unroofs[10], infuses[10], fusions[10], refuses[10], fissure[10], fussier[10], senecio[9], sincere[9], encores[9], necrose[9], coiners[9], cronies[9], orceins[9], recoins[9], essence[9], cession[9], cosines[9], oscines[9], creeses[9], cerises[9], censers[9], screens[9], secerns[9], censors[9], incross[9], roscoes[9], cresses[9], crosses[9], scissor[9], coenure[9], coenuri[9], censure[9], incuses[9], cousins[9], ceruses[9], recuses[9], rescues[9], secures[9], cruises[9], eserine[7], erosion[7], eosines[7], serenes[7], seiners[7], sereins[7], serines[7], soirees[7], senores[7], seniors[7], sonsier[7], noosers[7], sooners[7], orisons[7], senseis[7], essoins[7], osseins[7], session[7], seeress[7], seisers[7], seisors[7], sensors[7], soroses[7], sorosis[7], urinose[7], onerous[7], reissue[7], seisure[7], ensures[7], insures[7]