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From letters K, L, E, P, T, O, M, A, N, I, A, C, S  I made following words

13 letter words

kleptomaniacs[23]

12 letter words

kleptomaniac[22], kleptomanias[20]

11 letter words

kleptomania[19], complaisant[17]

10 letter words

alpenstock[18], campaniles[16], aposematic[16], complaints[16], semantical[14], analeptics[14], placations[14], neoplastic[14], pleonastic[14], palmations[14], escalation[12]

9 letter words

kamacites[17], mocktails[17], skeptical[17], stockpile[17], campanile[15], policeman[15], kalsomine[15], eclampsia[15], manciples[15], campesino[15], companies[15], complains[15], complines[15], complaint[15], compliant[15], clankiest[15], antismoke[15], pastalike[15], plasmatic[15], ectoplasm[15], analcimes[13], calamines[13], alopecias[13], melanotic[13], analeptic[13], placation[13], palmation[13], calamites[13], calamints[13], claimants[13], mislocate[13], anosmatic[13], coinmates[13], encomiast[13], anapestic[13], placentas[13], scapolite[13], conepatls[13], ptomaines[13], platonism[13], simpleton[13], anomalies[11], neoplasia[11], analcites[11], anelastic[11], laitances[11], laminates[11], stamineal[11], caseation[11], scalation[11], coastline[11], sectional[11], anatomies[11], anatomise[11], atonalism[11], semitonal[11], palatines[11], talapoins[11], antipoles[11]

8 letter words

pancakes[16], capeskin[16], kamacite[16], mocktail[16], micklest[16], stickman[16], stickmen[16], comatiks[16], placeman[14], manciple[14], complain[14], compline[14], moleskin[14], misplace[14], skiplane[14], spaceman[14], pemicans[14], soaplike[14], oilcamps[14], compiles[14], complies[14], polemics[14], campions[14], complins[14], moatlike[14], antilock[14], compleat[14], pentomic[14], mastlike[14], katcinas[14], antimask[14], mistaken[14], oatcakes[14], linstock[14], analcime[12], calamine[12], alopecia[12], camelias[12], amnesiac[12], manacles[12], melanics[12], meniscal[12], camisole[12], kaolines[12], maniocas[12], laconism[12], limacons[12], capelans[12], scalepan[12], calpains[12], capelins[12], panicles[12], pelicans[12], paeanism[12], impanels[12], maniples[12], episomal[12], canopies[12], pinocles[12], neoplasm[12], pleonasm[12], lampions[12], calamite[12], antileak[12], calamint[12], claimant[12], celomata[12], atomical[12], anatomic[12], coinmate[12], placenta[12], poetical[12], lipomata[12], conepatl[12], platonic[12], leptonic[12], ptomaine[12], clematis[12], climates[12], meticals[12], alkanets[12], lankiest[12], amnestic[12], semantic[12], keitloas[12], canalise[10], laminose[10], semolina[10], opalines[10], analcite[10], laitance[10], antimale[10], laminate[10], palatine[10], talapoin[10], antipole[10], estancia[10], analects[10], santalic[10], canistel[10], amentias[10], animates[10], talesman[10], staminal[10], talisman[10], ailments[10], aliments[10], manliest[10], melanist[10], smaltine[10], cataloes[10], coaliest[10], societal[10], oatmeals[10], loamiest[10], aconites[10], canoeist[10], sonicate[10], lactones[10], lections[10], telsonic[10], alations[8], elations[8], insolate[8], toenails[8]