use '?' for JOKER (blank)

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

15 letter words

reconnaissances[19]

14 letter words

reconnaissance[18]

12 letter words

reaccessions[16], renaissances[14]

11 letter words

nonsciences[15], reaccession[15], conciseness[15], accessaries[15], accessories[15], accessorise[15], renaissance[13], canninesses[13], corninesses[13]

10 letter words

innocences[14], nonscience[14], nascencies[14], arccosines[14], accessions[14], scarceness[14], cannoneers[12], cannonries[12], resonances[12], recensions[12], naissances[12], assonances[12], canonesses[12], ascensions[12], racinesses[12], coarseness[12], recessions[12], insaneness[10], ironnesses[10]

9 letter words

innocence[13], arccosine[13], cocineras[13], cicerones[13], croceines[13], nascences[13], accession[13], ensconces[13], carcasses[13], cannoneer[11], canneries[11], narceines[11], resonance[11], canonries[11], recension[11], naissance[11], canniness[11], assonance[11], ascension[11], canonises[11], cesareans[11], cesarians[11], increases[11], scenarios[11], recession[11], corniness[11], noncrises[11], secession[11], scansions[11], ancresses[11], scariness[11], incrosses[11], inaneness[9], anserines[9], innerness[9], nonsenses[9], reseasons[9], seasoners[9]

8 letter words

cocinera[12], cicerone[12], croceine[12], nascence[12], cocaines[12], ensconce[12], cariocas[12], cicorees[12], conciser[12], cornices[12], croceins[12], concerns[12], sciences[12], carcases[12], cercises[12], accesses[12], encaenia[10], narceine[10], canonise[10], cesarean[10], acarines[10], canaries[10], cesarian[10], sarcinae[10], increase[10], crannies[10], narceins[10], ocarinas[10], scenario[10], onscreen[10], incenses[10], niceness[10], senecios[10], canoness[10], sonances[10], scansion[10], casernes[10], acrasins[10], sarcinas[10], arcsines[10], arsenics[10], raciness[10], scanners[10], rosaceas[10], scariose[10], coarsens[10], narcoses[10], necroses[10], narcosis[10], necrosis[10], caseases[10], cassenas[10], cassenes[10], cassinas[10], cassines[10], caseoses[10], caissons[10], cassinos[10], cessions[10], cosiness[10], caresses[10], anserine[8], raisonne[8], nonsense[8], ensnares[8], nearness[8], rennases[8], insnares[8], reseason[8], seasoner[8], erasions[8], sensoria[8], ironness[8], easiness[8], saneness[8], enosises[8], noesises[8], nosiness[8], soreness[8], rosiness[8]

7 letter words

cocaine[11], oceanic[11], canonic[11], eccrine[11], carioca[11], cicoree[11], acronic[11], cornice[11], crocein[11], crocine[11], concern[11], science[11], cancans[11], cocains[11], concise[11], carcase[11], carices[11], cancers[11], acarine[9], carinae[9], cannier[9], narcein[9], ocarina[9], canines[9], encinas[9], nancies[9], incense[9], acinose[9], senecio[9], ancones[9], sonance[9], conines[9], cannons[9], careens[9], caserne[9], recanes[9], acrasin[9], arnicas[9], carinas[9], sarcina[9], arcsine[9], arsenic[9], carnies[9], sincere[9], canners[9], scanner[9], aeonian[7], nannies[7], annonas[7], ensnare[7]