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From letters P, O, L, Y, S, A, C, C, H, A, R, I, D, E, S  I made following words

15 letter words

polysaccharides[28]

14 letter words

polysaccharide[27]

12 letter words

cyclopaedias[22]

11 letter words

hydrospaces[22], cyclopaedia[21], cyclopedias[21], chrysalides[20], rhapsodical[19], saccharides[19], caryopsides[19], icosahedral[17], diaphorases[17], corydalises[17], accessorial[15]

10 letter words

hydrospace[21], cyclopedia[20], preholiday[19], diaphyseal[19], chrysalids[19], dysphorias[19], hydropsies[19], charcoaled[18], saccharide[18], childcares[18], crispheads[18], clepsydras[18], horseplays[18], aircoaches[17], aspherical[17], calipashes[17], holidayers[17], hydrolases[17], charladies[16], icosahedra[16], diaphorase[16], spheroidal[16], rhapsodies[16], displayers[16], redisplays[16], asclepiads[15], displacers[15], radiolyses[14]

9 letter words

psychical[21], hyperacid[20], dysphoric[20], dysphasic[20], charcoaly[19], preachily[19], coryphaei[19], physicals[19], acephalic[18], pachalics[18], polyhedra[18], dyarchies[18], chrysalid[18], hyracoids[18], dysphoria[18], dysphasia[18], diaphyses[18], ladyships[18], shipyards[18], hydropses[18], childcare[17], cochaired[17], characids[17], scraiched[17], clochards[17], crisphead[17], pilchards[17], rhapsodic[17], scaphoids[17], clepsydra[17], copyreads[17], horseplay[17], dyscrasic[17], chrysalis[17], pedocalic[16], choleraic[16], eparchial[16], parochial[16], caroaches[16], charcoals[16], spherical[16], pashalics[16], parchesis[16], holidayer[16], hydrolase[16], calypsoes[16], accessary[16], accessory[16], caryopses[16], caryopsis[16], precocial[15], archaised[15], chlorides[15], cecropias[15], aphorised[15], coalsheds[15], asphodels[15], shiploads[15], crosshead[15], calcspars[15], ascocarps[15], rhapsodes[15], spheroids[15], lordships[15], coalyards[15], corydalis[15], paralysed[15], displayer[15], redisplay[15], dysplasia[15], dyscrasia[15], caracoled[14], parodical[14], caprioled[14], accolades[14], asclepiad[14], displacer[14], picadores[14], dropsical[14], displaces[14], slipcased[14], cardcases[14], archaises[14], earlships[14], splashier[14], scorepads[14], aphorises[14], polishers[14], paralyses[14], paralysis[14], alopecias[13], railheads[13], caracoles[13], capoeiras[13], prosaical[13], caprioles[13], headsails[13], airscapes[13], airspaces[13], spiracles[13], parcloses[13], proclises[13], dialysers[13], parasoled[12], polarised[12], caseloads[12], palisades[12], ascarides[12], laserdisc[12], idocrases[12], discloser[12], paradises[12], dispersal[12], paradoses[12], diasporas[12], diaspores[12], psoraleas[11], polarises[11], solarised[10]

8 letter words

pachalic[17], cephalic[17], chaliced[16], cephalad[16], characid[16], clochard[16], pilchard[16], chalcids[16], aircoach[15], charcoal[15], cochlear[15], choleric[15], parhelic[15], poachier[15], orphical[15], caliches[15], chalices[15], cochleas[15], alopecic[14], heraldic[14], chloride[14], cecropia[14], coalshed[14], cheloids[14], accolade[13], ecocidal[13], heroical[13], parhelia[13], acholias[13], alopecia[12], railhead[12], caracole[12], capoeira[12], capriole[12], headsail[12], calicoes[12], praedial[11], alcaides[11], caseload[11]