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From letters D, E, U, T, E, R, A, G, O, N, I, S, T, S  I made following words

14 letter words

deuteragonists[16]

13 letter words

deuteragonist[15]

12 letter words

degustations[14], deuterations[13]

11 letter words

designators[13], outdressing[13], deuterating[13], degustation[13], restationed[12], deuteration[12], outsteering[12], unsteadiest[12], understates[12]

10 letter words

gesneriads[12], reassigned[12], denigrates[12], designator[12], redingotes[12], designates[12], negotiated[12], integrated[12], noseguards[12], sandgrouse[12], outreading[12], negritudes[12], soundstage[12], outdesigns[12], turgidness[12], stroudings[12], outtrading[12], gratitudes[12], stingarees[11], adroitness[11], intradoses[11], desertions[11], orientated[11], negotiates[11], denitrates[11], reinstated[11], straitened[11], argentites[11], estreating[11], integrates[11], interstage[11], teratogens[11], gestations[11], dissertate[11], strategies[11], autogenies[11], unreadiest[11], unsteadier[11], entourages[11], unsteadies[11], signatures[11], sudatories[11], detrusions[11], resituated[11], understate[11], trusteeing[11], outstaring[11], testudines[11], gustations[11], denturists[11], russetting[11], outstrides[11], orientates[10], reinstates[10], restations[10], stationers[10], austenites[10], resituates[10]

9 letter words

gesneriad[11], renegados[11], grandiose[11], organdies[11], organised[11], diagnoses[11], disagrees[11], designers[11], redesigns[11], engrossed[11], denigrate[11], gratineed[11], redingote[11], designate[11], tragedies[11], estranged[11], astringed[11], gradients[11], deserting[11], derogates[11], dragonets[11], steadings[11], geodesist[11], digesters[11], redigests[11], digestors[11], deratting[11], detesting[11], stodgiest[11], gauderies[11], dungarees[11], underages[11], ungreased[11], dangerous[11], arsenides[10], nearsides[10], readiness[10], indorsees[10], organises[10], egression[10], detainers[10], resinated[10], agentries[10], gratinees[10], reseating[10], stingaree[10], resonated[10], ordinates[10], desertion[10], orangiest[10], stereoing[10], andesites[10], sedations[10], agonistes[10], egestions[10], steadiers[10], greasiest[10], estranges[10], greatness[10], sergeants[10], tardiness[10], dissenter[10], residents[10], tiredness[10], asserting[10], astringes[10], ganisters[10], asteroids[10], estragons[10], estrogens[10], assorting[10], organists[10], negotiate[10], denitrate[10], intreated[10], argentite[10], integrate[10], teratogen[10], tetanised[10], detonates[10], antidotes[10], stationed[10], gestation[10], aigrettes[10], attenders[10], transited[10], trendiest[10], restating[10], retasting[10], resetting[10], retesting[10], adroitest[10], tetragons[10], stateside[10], steadiest[10], dottiness[10], grisettes[10], strangest[10], strongest[10], arsenites[9], irateness[9], resinates[9], stearines[9], teariness[9], earstones[9], resonates[9], assertion[9], senoritas[9], serotines[9], orientate[9], reinstate[9], restation[9], stationer[9], tenorites[9], anisettes[9], tetanises[9], noisettes[9], teosintes[9], sestertia[9], treatises[9], resistant[9], straitens[9], tartiness[9], insetters[9], interests[9], sternites[9], triteness[9], strontias[9], tenorists[9]