use '?' for JOKER (blank)

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

15 letter words

repetitiousness[17]

13 letter words

superstitions[15], strenuosities[13]

12 letter words

prettinesses[14], superstition[14]

11 letter words

petitioners[13], repetitions[13], posterities[13], pettinesses[13], pottinesses[13], piteousness[13], repetitious[13], pretentious[13], enteritises[11], tritenesses[11], utternesses[11], ruttinesses[11]

10 letter words

ripenesses[12], ropinesses[12], interposes[12], pertnesses[12], stereopses[12], stereopsis[12], sportiness[12], petitioner[12], repetition[12], petiteness[12], persistent[12], pinsetters[12], presentist[12], prettiness[12], spottiness[12], stepsister[12], sternposts[12], purenesses[12], outpresses[12], pirouettes[12], superettes[12], proustites[12], outsprints[12], poussettes[12], posturists[12], serenities[10], serotinies[10], serosities[10], entireties[10], eternities[10], enuresises[10], neuritises[10], truenesses[10], sinistrous[10], routinists[10], trustiness[10], tutoresses[10]

9 letter words

isoprenes[11], responses[11], prosiness[11], entropies[11], interpose[11], pretenses[11], poetisers[11], steepness[11], tipsiness[11], poetesses[11], priestess[11], prissiest[11], spinsters[11], petitions[11], pointiest[11], pinsetter[11], potteries[11], entrepots[11], pettiness[11], postteens[11], nepotists[11], pottiness[11], stripiest[11], sportiest[11], sternpost[11], piousness[11], suspenser[11], pursiness[11], espousers[11], repousses[11], suspensor[11], preunites[11], outpreens[11], eruptions[11], sirupiest[11], proteuses[11], spiritous[11], pertusses[11], pertussis[11], pirouette[11], outpities[11], superette[11], inputters[11], proustite[11], outsprint[11], printouts[11], petuntses[11], poussette[11], upsetters[11], turnspits[11], outstrips[11], posturist[11], eternises[9], sneeriest[9], serotines[9], sensitise[9], essonites[9], terseness[9], insisters[9], teentsier[9], enteritis[9], interties[9], retinites[9], tenorites[9], teensiest[9], tensities[9], noisettes[9], teosintes[9], insetters[9], interests[9], sternites[9], triteness[9], tenorists[9], testiness[9], tressiest[9], rustiness[9], oestruses[9], tenuities[9], routinist[9], snoutiest[9], sostenuti[9], tessiture[9], utterness[9], ruttiness[9], outsteers[9], stoutness[9]

8 letter words

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], pointier[10], preteens[10], pretense[10], terpenes[10], pristine[10], poetiser[10], poetries[10], pointers[10], porniest[10], proteins[10], tropines[10], epeeists[10], seepiest[10], steepens[10], spiniest[10], poetises[10], pentoses[10], posteens[10], steepers[10], respites[10], spiriest[10], pensters[10], pertness[10], eeriness[8], eserines[8], enosises[8], noesises[8], soreness[8], rosiness[8], eternise[8], teensier[8], niteries[8], oneriest[8], serotine[8], sienites[8], essonite[8], inosites[8], noisiest[8], serenest[8], sentries[8], insister[8], sinister[8], estrones[8], oestrins[8], ironists[8]