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From letters E, C, D, Y, S, I, A, S, T, S  I made following words

10 letter words

ecdysiasts[16]

9 letter words

ecdysiast[15]

8 letter words

discases[11], dissects[11], essayist[11], assisted[9], disseats[9]

7 letter words

ecdysis[13], edacity[13], ecstasy[12], discase[10], dacites[10], dicasts[10], dissect[10], ascesis[9], ascites[9], ectasis[9], dassies[8], disseat[8], sadists[8], desists[8], siestas[7], tassies[7]

6 letter words

decays[12], cyesis[11], sayeds[10], sayids[10], stayed[10], steady[10], asdics[9], dacite[9], cadets[9], dicast[9], cisted[9], edicts[9], essays[9], sayest[9], yeasts[9], saices[8], cassis[8], castes[8], cestas[8], asides[7], daises[7], dassie[7], sassed[7], disses[7], stades[7], steads[7], tsades[7], sadist[7], tsadis[7], deists[7], desist[7], siesta[6], tassie[6], assets[6], stases[6], tasses[6], assist[6], stasis[6]

5 letter words

decay[11], acidy[11], dicey[11], dicty[11], syces[10], cissy[10], cysts[10], sayed[9], daisy[9], sayid[9], deity[9], styed[9], ditsy[9], cades[8], cased[8], daces[8], acids[8], asdic[8], cadis[8], caids[8], cedis[8], dices[8], scads[8], discs[8], acted[8], cadet[8], dicta[8], cited[8], edict[8], essay[8], eyass[8], sassy[8], sissy[8], yeast[8], yetis[8], sayst[8], stays[8], styes[8], saice[7], cases[7], sices[7], caste[7], cates[7], cesta[7], taces[7], cesti[7], cites[7], casts[7], scats[7], sects[7], cists[7], aides[6], aside[6], ideas[6], sades[6], sadis[6], saids[6], sides[6], dates[6], sated[6], stade[6], stead[6], tsade[6], adits[6], ditas[6], staid[6], tsadi[6], deist[6], diets[6], dites[6], edits[6], sited[6], stied[6], tides[6], asses[5], sises[5], asset[5], easts[5], sates[5], seats[5], tasse[5], satis[5], sites[5], sties[5]

4 letter words

aced[7], cade[7], dace[7], acid[7], cadi[7], caid[7], cedi[7], dice[7], iced[7], cads[7], scad[7], disc[7], aces[6], case[6], asci[6], ices[6], sice[6], sacs[6], cess[6], secs[6], sics[6], cate[6], tace[6], cite[6], etic[6], acts[6], cast[6], cats[6], scat[6], aide[5], idea[5], sade[5], aids[5], dais[5], sadi[5], said[5], dies[5], ides[5], side[5], diss[5], date[5], adit[5], dita[5], diet[5], dite[5], edit[5], tide[5], tied[5], tads[5], seas[4], seis[4], sass[4], ates[4], east[4], eats[4]