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From letters D, I, R, E, C, T, I, O, N, L, E, S, S  I made following words

13 letter words

directionless[16]

12 letter words

derelictions[15]

11 letter words

dereliction[14], stridencies[14], coresidents[14], discretions[14], corneitises[13], siderolites[12]

10 letter words

deciliters[13], decilitres[13], indiscreet[13], iridescent[13], cloistered[13], clitorides[13], coresident[13], directions[13], discretion[13], declinists[13], dissection[13], directness[13], stridences[13], centrioles[12], relictions[12], selections[12], stencilers[12], clitorises[12], resections[12], secretions[12], sclerotins[12], eledoisins[11], sideliners[11], soldieries[11], siderolite[11], reeditions[11], sterilised[11], desertions[11], disorients[11], serotinies[10]

9 letter words

decliners[12], creolised[12], solecised[12], decisions[12], sclereids[12], sclerosed[12], discloser[12], seconders[12], considers[12], incrossed[12], deciliter[12], decilitre[12], reincited[12], doleritic[12], recondite[12], cretinoid[12], direction[12], indictees[12], denticles[12], stenciled[12], declinist[12], idiolects[12], solicited[12], sectioned[12], editrices[12], derelicts[12], stridence[12], indicters[12], reindicts[12], siderotic[12], centroids[12], doctrines[12], indictors[12], consisted[12], crosstied[12], dissector[12], isoclines[11], silicones[11], clerisies[11], licensers[11], silencers[11], creolises[11], recession[11], recisions[11], enclosers[11], ensorcels[11], inclosers[11], licensors[11], centriole[11], reliction[11], insectile[11], selenitic[11], elections[11], selection[11], reincites[11], stenciler[11], elicitors[11], erections[11], neoterics[11], resection[11], secretion[11], corneitis[11], electrons[11], sclerotin[11], licitness[11], societies[11], colitises[11], seicentos[11], colistins[11], sclerites[11], trisceles[11], scleritis[11], secretins[11], sincerest[11], isosteric[11], corselets[11], selectors[11], cloisters[11], coistrels[11], coistrils[11], eledoisin[10], sideliner[10], sidelines[10], idolisers[10], indorsees[10], derisions[10], ironsides[10], resinoids[10], reedition[10], deletions[10], tolidines[10], dolerites[10], desertion[10], disorient[10], retinoids[10], rondelets[10], densities[10], destinies[10], seditions[10], siderites[10], dissenter[10], residents[10], tiredness[10], dirtiness[10], disinters[10], lionisers[9], resilient[9], sterilise[9], enlisters[9], listeners[9], reenlists[9], serotines[9], entresols[9]

8 letter words

indocile[11], decliner[11], reclined[11], recoiled[11], recoined[11], declines[11], licensed[11], silenced[11], dioecies[11], codeines[11], decision[11], enclosed[11], inclosed[11], sclereid[11], scleroid[11], censored[11], encoders[11], necrosed[11], seconder[11], consider[11], crinoids[11], cineoles[10], isocline[10], silicone[10], licenser[10], reclines[10], silencer[10], creolise[10], recision[10], soricine[10], encloser[10], ensorcel[10], incloser[10], licensor[10], licenses[10], silences[10], sideline[9], lesioned[9], lionised[9], redlines[9], idoliser[9], indorsee[9], derision[9], ironside[9], resinoid[9], idleness[9], linseeds[9], eloiners[8], lioniser[8]