use '?' for JOKER (blank)

From letters R, E, T, E, N, T, I, V, E, N, E, S, S, E, S  I made following words

15 letter words

retentivenesses[18]

13 letter words

retentiveness[16]

12 letter words

inventresses[15], entirenesses[12]

11 letter words

invernesses[14], nervinesses[14], restiveness[14], inertnesses[11], tritenesses[11]

10 letter words

evennesses[13], severeness[13], intervenes[13], seventeens[13], inventress[13], serviettes[13], eerinesses[10], sereneness[10], entireness[10]

9 letter words

inverness[12], nerviness[12], intervene[12], seventeen[12], resentive[12], inventers[12], reinvents[12], seventies[12], reinvests[12], sirventes[12], retentive[12], serviette[12], internees[9], retinenes[9], eternises[9], sneeriest[9], inertness[9], tenseness[9], terseness[9], sternness[9], teentsier[9], teensiest[9], intensest[9], sentients[9], insetters[9], interests[9], sternites[9], triteness[9], testiness[9], tressiest[9]

8 letter words

veneries[11], innerves[11], nervines[11], evenness[11], inverses[11], versines[11], inventer[11], reinvent[11], nerviest[11], reinvest[11], sirvente[11], vintners[11], severest[11], sieverts[11], vestries[11], vitesses[11], eeriness[8], eserines[8], internee[8], retinene[8], eternise[8], teensier[8], intenser[8], internes[8], tennises[8], serenest[8], sentries[8], sestines[8], renitent[8], teeniest[8], ententes[8], sentient[8], insetter[8], interest[8], sternite[8], trientes[8], tennists[8], sternest[8], stinters[8]

7 letter words

innerve[10], nervine[10], venenes[10], venines[10], veeries[10], eveners[10], veneers[10], enviers[10], inverse[10], veiners[10], venires[10], versine[10], revises[10], vintner[10], evenest[10], tensive[10], invents[10], restive[10], sievert[10], veriest[10], verites[10], venters[10], inverts[10], striven[10], steeves[10], vestees[10], vitesse[10], invests[10], revests[10], versets[10], verstes[10], stivers[10], strives[10], verists[10], trevets[10], vetters[10], trivets[10], eserine[7], serenes[7], seiners[7], sereins[7], serines[7], sinners[7], senseis[7], seeress[7], seisers[7], teenier[7], interne[7], intense[7], tennies[7], eeriest[7], entrees[7], retenes[7], teeners[7], entires[7], entries[7], retines[7], trienes[7], rennets[7], tenners[7], interns[7], tinners[7], sestine[7], sennets[7], sennits[7], resites[7], nesters[7], renests[7], resents[7], estrins[7], inserts[7], sinters[7], tresses[7], resists[7], sisters[7], entente[7], nettier[7], tentier[7], intents[7], tennist[7], teeters[7], testier[7], netters[7], tenters[7], retints[7], stinter[7], tinters[7], settees[7], testees[7], tensest[7], retests[7], setters[7], streets[7], tersest[7], testers[7], sitters[7], sestets[7], tsetses[7]

6 letter words

reseen[6], serene[6], nereis[6], seiner[6], serein[6], serine[6], inners[6], renins[6], sinner[6], seines[6], sensei[6], resees[6], seiser[6], series[6], sirees[6]