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From letters D, E, M, O, N, O, L, O, G, I, S, T, S  I made following words

13 letter words

demonologists[17]

12 letter words

demonologist[16]

11 letter words

monologists[14], nostologies[12]

10 letter words

mongoloids[14], monologies[13], nomologies[13], gloominess[13], neologisms[13], monologist[13], goldstones[12], motionless[12], nosologies[11], ontologies[11], enologists[11], neologists[11]

9 letter words

mongoloid[13], modelings[13], mislodges[13], smidgeons[13], lodgments[13], neologism[12], moldiness[12], moodiness[12], mongooses[12], molesting[12], dolomites[12], gloomiest[12], demotions[12], monoglots[12], melodists[12], modelists[12], demonists[12], sodomites[12], monodists[12], godliness[11], simoleons[11], goodliest[11], goldstone[11], stegodons[11], solenoids[10], enologist[10], neologist[10], otologies[10], oologists[10], oilstones[9]

8 letter words

modeling[12], mislodge[12], mendigos[12], smidgeon[12], moldings[12], smidgens[12], demoting[12], lodgment[12], dominoes[11], monodies[11], longsome[11], mongoose[11], monologs[11], mildness[11], mindless[11], midsoles[11], sodomies[11], endosmos[11], osmosing[11], longtime[11], dolomite[11], demotion[11], motioned[11], monoglot[11], smelting[11], melodist[11], modelist[11], moldiest[11], demonist[11], mitogens[11], doomiest[11], moodiest[11], sodomite[11], monodist[11], mindsets[11], mistends[11], distomes[11], modistes[11], egotisms[11], gnomists[11], sodomist[11], sidelong[10], oinomels[10], simoleon[10], goodness[10], moonless[10], goldtone[10], godliest[10], toilsome[10], stegodon[10], emotions[10], mooniest[10], moonlets[10], mestinos[10], moistens[10], sentimos[10], ostomies[10], moonsets[10], mootness[10], eidolons[9], solenoid[9], oologies[9], loginess[9], isogones[9], lentoids[9], gooniest[9], stooling[9], toolings[9], oologist[9], glistens[9], singlets[9], sniglets[9], solidest[9], osteoids[9], goosiest[9], ologists[9], looniest[8], oilstone[8], ostioles[8], stoolies[8], isotones[8], solonets[8], solitons[8]

7 letter words

melding[11], mingled[11], demoing[11], mendigo[11], molding[11], gloomed[11], goodmen[11], dooming[11], midlegs[11], smidgen[11], smidges[11], looming[10], monolog[10], mildens[10], mingles[10], meloids[10], midsole[10], semilog[10], domines[10], emodins[10], misdone[10], dolmens[10], mongoes[10], dominos[10], mongols[10], dimness[10], missend[10], messing[10], misdoes[10], egoisms[10], glenoid[9], oinomel[9], dingles[9], engilds[9], singled[9], dingoes[9], dongles[9], lomeins[9], goodies[9], noodges[9], noisome[9], designs[9], simnels[9], glossed[9], godless[9], lissome[9], dossing[9], eidolon[8], indoles[8], eloigns[8], legions[8], lingoes[8], longies[8], doolies[8], ologies[8], goonies[8], isogone[8], noogies[8], noodles[8], snooled[8], oodlins[8], logions[8], loosing[8], olingos[8], soloing[8], oolongs[8], singles[8], oldness[8], loonies[7], insoles[7], lesions[7]