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

15 letter words

fortunatenesses[18]

13 letter words

fortunateness[16]

12 letter words

ornatenesses[12], rottennesses[12]

11 letter words

earnestness[11], austereness[11], utternesses[11]

10 letter words

freestones[13], fenestrate[13], foretastes[13], unforeseen[13], transfuses[13], fortunates[13], nearnesses[10], ornateness[10], sonneteers[10], neatnesses[10], rottenness[10], tartnesses[10], truenesses[10], turnstones[10], astuteness[10], tautnesses[10], tutoresses[10]

9 letter words

farnesses[12], fenestrae[12], freestone[12], fasteners[12], refastens[12], seafronts[12], resoftens[12], softeners[12], fatnesses[12], fatteners[12], enfetters[12], foretaste[12], fossettes[12], furanoses[12], fourteens[12], unfastens[12], transfuse[12], fortunate[12], unfetters[12], outfeasts[12], onenesses[9], reseasons[9], seasoners[9], sonneteer[9], earstones[9], resonates[9], resonants[9], tenseness[9], esterases[9], assenters[9], sarsenets[9], terseness[9], sternness[9], assentors[9], starnoses[9], sternsons[9], setenants[9], unreasons[9], sauternes[9], anestrous[9], sunstones[9], ossatures[9], oestruses[9], transeunt[9], turnstone[9], tetanuses[9], austerest[9], utterness[9], outstares[9], seatrouts[9], outsteers[9], stoutness[9]

8 letter words

foreseen[11], freeness[11], foresees[11], safeness[11], fastener[11], fenestra[11], refasten[11], seafront[11], resoften[11], softener[11], feasters[11], fastness[11], softness[11], fattener[11], enfetter[11], oftenest[11], fossette[11], furanose[11], fenurons[11], fourteen[11], unfasten[11], features[11], fortunes[11], foetuses[11], unfetter[11], outfeast[11], fouettes[11], tartufes[11], outfasts[11], ensnares[8], nearness[8], rennases[8], reseason[8], seasoner[8], saneness[8], soreness[8], neonates[8], serenate[8], earstone[8], resonate[8], resonant[8], enterons[8], tenoners[8], neatness[8], esterase[8], tesserae[8], assenter[8], earnests[8], sarsenet[8], serenest[8], assentor[8], santeros[8], senators[8], starnose[8], treasons[8], estrones[8], sternson[8], sensates[8], stenoses[8], sarsnets[8], ossetras[8], setenant[8], ententes[8], entreats[8], ratteens[8], entrants[8], estreats[8], restates[8], retastes[8], tartness[8], sternest[8], toasters[8], rosettes[8], stentors[8], stetsons[8], unreason[8], neurones[8], anureses[8], enureses[8], anserous[8], arsenous[8], neuroses[8], nonusers[8], sureness[8], sourness[8], unornate[8], tonneaus[8], sauterne[8], outearns[8], neutrons[8], soutanes[8], stannous[8], neustons[8], sunstone[8], anestrus[8], saunters[8], trueness[8], stunners[8], ossature[8], santours[8], tonsures[8], estruses[8], unstress[8], tussores[8], outeaten[8], taunters[8], outrates[8], outstare[8], seatrout[8], outsteer[8], tautness[8], unstates[8], stoutens[8], statures[8], trustees[8], entrusts[8], stratous[8], outserts[8], tutoress[8], statuses[8]

7 letter words

fanners[10], foresee[10], ensnare[7], rennase[7]