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

14 letter words

expressionists[23]

13 letter words

expressionist[22]

12 letter words

sportinesses[14]

11 letter words

expressions[20], prosinesses[13], tipsinesses[13]

10 letter words

expression[19], pixinesses[19], exsertions[17], ropinesses[12], prissiness[12], interposes[12], stereopsis[12], sportiness[12], rosinesses[10], serotinies[10], serosities[10], sensitises[10]

9 letter words

expressos[18], inexperts[18], preexists[18], exertions[16], exsertion[16], extensors[16], isoprenes[11], responses[11], prosiness[11], espressos[11], repossess[11], entropies[11], interpose[11], poetisers[11], tipsiness[11], priestess[11], prissiest[11], spinsters[11], serotines[9], sensitise[9], essonites[9], insisters[9]

8 letter words

expiries[17], pixiness[17], exposers[17], expresso[17], inexpert[17], preexist[17], exposits[17], sexiness[15], exertion[15], intersex[15], extensor[15], sixteens[15], pineries[10], isoprene[10], pereions[10], pioneers[10], ripienos[10], erepsins[10], ripeness[10], inspires[10], response[10], ropiness[10], isospins[10], prissies[10], espresso[10], prossies[10], pissoirs[10], speisses[10], pointier[10], pristine[10], poetiser[10], poetries[10], pointers[10], porniest[10], proteins[10], tropines[10], spiniest[10], poetises[10], pentoses[10], posteens[10], respites[10], spiriest[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], enosises[8], noesises[8], soreness[8], rosiness[8], sessions[8], niteries[8], oneriest[8], serotine[8], sienites[8], essonite[8], inosites[8], noisiest[8], sentries[8], insister[8], sinister[8], estrones[8], oestrins[8], ironists[8], sestines[8], stenoses[8], sonsiest[8], stenosis[8], sissiest[8], stresses[8]

7 letter words

pereion[9], pioneer[9], ripieno[9], peonies[9], sinopie[9], erepsin[9], repines[9], inspire[9], spinier[9], openers[9], pereons[9], reopens[9], orpines[9], penises[9], poesies[9], spinose[9], isospin[9], snipers[9], reposes[9], poisers[9], prossie[9], pissoir[9], persons[9], prisons[9], spinors[9], speises[9], spenses[9], presses[9], pissers[9], prisses[9], prosses[9], possess[9], pointer[9], protein[9], tropine[9], pieties[9], piniest[9], pinites[9], tiepins[9], poetise[9], openest[9], pentose[9], posteen[9], poteens[9], pintoes[9], pointes[9], pestier[9], ironies[7], noisier[7], eosines[7], ionises[7], seiners[7], sereins[7], serines[7], soirees[7], senores[7], seniors[7], sonsier[7], senseis[7], seisins[7], essoins[7], osseins[7], session[7], seisers[7], sissier[7], seisors[7], sensors[7], sissies[7], niterie[7], sienite[7], inosite[7], entires[7], entries[7], retines[7], trienes[7], estrone[7], norites[7], oestrin[7], orients[7], stonier[7], ironist[7]