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From letters P, E, C, T, I, N, E, S, T, E, R, A, S, E, S  I made following words

15 letter words

pectinesterases[19]

14 letter words

pectinesterase[18]

12 letter words

creepinesses[16], persistences[16], streetscapes[16], necessitates[14], petitenesses[14], prettinesses[14]

11 letter words

preciseness[15], interspaces[15], persistence[15], pacesetters[15], streetscape[15], necessaries[13], septenaries[13], erectnesses[13], resistances[13], peartnesses[13], spessartine[13], necessitate[13], cattinesses[13], tacitnesses[13], pettinesses[13], spessartite[13], stripteases[13], iratenesses[11], tearinesses[11], tartinesses[11], tritenesses[11]

10 letter words

esperances[14], creepiness[14], princesses[14], interspace[14], epicenters[14], reinspects[14], pacesetter[14], crepitates[14], intercepts[14], racinesses[12], passerines[12], ripenesses[12], ancestries[12], resistance[12], presentees[12], pistareens[12], sparteines[12], antisepses[12], cateresses[12], ancestress[12], scenarists[12], raptnesses[12], pertnesses[12], certainest[12], intercaste[12], penetrates[12], petiteness[12], intersects[12], striptease[12], tapestries[12], persistent[12], pinsetters[12], presentist[12], prettiness[12], tesseracts[12], strictness[12], stairsteps[12], stepsister[12], eerinesses[10], artinesses[10], entreaties[10], reinstates[10], titanesses[10], tartnesses[10], antistress[10], resistants[10], straitness[10]

9 letter words

earpieces[13], esperance[13], seapieces[13], sapiences[13], presences[13], princesse[13], spaciness[13], precesses[13], crispness[13], epicentra[13], epicenter[13], patencies[13], patiences[13], creepiest[13], preenacts[13], pretences[13], prentices[13], prescient[13], reinspect[13], speciates[13], practises[13], precisest[13], tricepses[13], escapists[13], pectinate[13], crepitate[13], crepitant[13], intercept[13], pittances[13], spectates[13], increases[11], sceneries[11], passerine[11], ancresses[11], scariness[11], peeresses[11], pessaries[11], spareness[11], raspiness[11], centiares[11], cisternae[11], creatines[11], iterances[11], nectaries[11], presentee[11], aperients[11], episterna[11], pistareen[11], sparteine[11], cineastes[11], creasiest[11], sectaries[11], reascents[11], sarcenets[11], erectness[11], canisters[11], scenarist[11], secretins[11], sincerest[11], peartness[11], pretenses[11], antipress[11], pinasters[11], pristanes[11], ecstasies[11], epistases[11], aptnesses[11], patnesses[11], steepness[11], pastiness[11], steapsins[11], actresses[11], sesterces[11], priestess[11], spinsters[11], penetrate[11], patienter[11], patentees[11], etceteras[11], catteries[11], recentest[11], interacts[11], intersect[11], triptanes[11], pinsetter[11], testacies[11], cattiness[11], scantiest[11], tacitness[11], pettiness[11], tesseract[11], secretest[11], transects[11], centrists[11], pretastes[11], stairstep[11], transepts[11], trapnests[11], arsenites[9], irateness[9], resinates[9], stearines[9], teariness[9], eternises[9], sneeriest[9], esterases[9], assenters[9], sarsenets[9], terseness[9], artsiness[9], reinstate[9], teentsier[9], anisettes[9], tetanises[9], teensiest[9], sestertia[9], treatises[9], resistant[9], straitens[9], tartiness[9], insetters[9], interests[9], sternites[9], triteness[9]