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

15 letter words

pestiferousness[20]

13 letter words

profusenesses[18], piteousnesses[15]

12 letter words

frostinesses[15], sportinesses[14], supersession[14], suspensories[14]

11 letter words

profuseness[16], pestiferous[16], firstnesses[14], fustinesses[14], prosinesses[13], priestesses[13], piousnesses[13], pursinesses[13], piteousness[13], pertussises[13], seriousness[11], rustinesses[11]

10 letter words

perfusions[15], stupefiers[15], rifenesses[13], freestones[13], firestones[13], frostiness[13], softnesses[13], interfuses[13], ripenesses[12], ropinesses[12], interposes[12], pertnesses[12], stereopses[12], stereopsis[12], sportiness[12], purenesses[12], suspensers[12], suspensors[12], outpresses[12], sorenesses[10], rosinesses[10], enuresises[10], surenesses[10], sournesses[10], truenesses[10], unstresses[10]

9 letter words

professes[14], frostnips[14], superfine[14], perfusion[14], putrefies[14], stupefier[14], stupefies[14], supersoft[14], freestone[12], firestone[12], infesters[12], resoftens[12], softeners[12], fitnesses[12], firstness[12], reinfuses[12], fussiness[12], interfuse[12], fourteens[12], fustiness[12], isoprenes[11], responses[11], prosiness[11], espressos[11], repossess[11], entropies[11], interpose[11], pretenses[11], poetisers[11], steepness[11], poetesses[11], priestess[11], spinsters[11], piousness[11], suspenser[11], pursiness[11], espousers[11], repousses[11], suspensor[11], suspenses[11], preunites[11], outpreens[11], eruptions[11], proteuses[11], pertusses[11], pertussis[11], eternises[9], sneeriest[9], serotines[9], essonites[9], terseness[9], rustiness[9], oestruses[9]

8 letter words

tepefies[13], firepots[13], pieforts[13], postfire[13], forspent[13], frostnip[13], presifts[13], perfuses[13], foreseen[11], freeness[11], rifeness[11], foresees[11], finesses[11], frissons[11], reefiest[11], ferniest[11], infester[11], resoften[11], softener[11], snifters[11], softness[11], reinfuse[11], infusers[11], fissures[11], isoprene[10], pereions[10], pioneers[10], erepsins[10], ripeness[10], response[10], ropiness[10], espresso[10], prossies[10], speisses[10], preteens[10], pretense[10], terpenes[10], poetiser[10], poetries[10], pointers[10], porniest[10], proteins[10], tropines[10], epeeists[10], seepiest[10], steepens[10], poetises[10], pentoses[10], posteens[10], steepers[10], respites[10], pensters[10], pertness[10], presents[10], serpents[10], spinster[10], prosiest[10], prosties[10], reposits[10], ripostes[10], triposes[10], posterns[10], stepsons[10], persists[10], penuries[10], resupine[10], pruinose[10], pureness[10], espouser[10], repousse[10], suspense[10], espouses[10], poussies[10], eeriness[8], eserines[8], enosises[8], noesises[8], soreness[8], rosiness[8], sessions[8], eternise[8], teensier[8], oneriest[8], serotine[8], essonite[8], serenest[8], sentries[8], estrones[8], oestrins[8], sestines[8], stenoses[8], sonsiest[8], stenosis[8], stresses[8], enureses[8], enuresis[8], neuroses[8], neurosis[8], resinous[8], reissues[8], seisures[8], sureness[8]