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From letters C, A, S, T, I, G, A, T, O, R, S  I made following words

11 letter words

castigators[14]

10 letter words

castigator[13]

9 letter words

castratos[11], agitators[10]

8 letter words

orgastic[11], castrati[10], castrato[10], citators[10], ricottas[10], astricts[10], orgiasts[9], agitator[9]

7 letter words

agarics[10], argotic[10], gastric[10], tragics[10], ascaris[9], caritas[9], ostraca[9], casitas[9], scotias[9], racists[9], sacrist[9], castors[9], costars[9], citator[9], ricotta[9], astatic[9], astrict[9], cottars[9], tricots[9], statics[9], orgiast[8], agitato[8], aristas[7], tarsias[7], aorists[7], aristos[7], satoris[7], striata[7], tatsois[7], stratas[7], artists[7], straits[7], tsarist[7], stators[7]

6 letter words

agaric[9], orgiac[9], cigars[9], cargos[9], corgis[9], scrags[9], tragic[9], scoria[8], cassia[8], crasis[8], crissa[8], across[8], aortic[8], casita[8], coatis[8], scotia[8], carats[8], crista[8], racist[8], triacs[8], actors[8], castor[8], costar[8], scrota[8], tarocs[8], torics[8], ascots[8], coasts[8], stoics[8], scarts[8], cottar[8], tricot[8], attics[8], static[8], cottas[8], tracts[8], strict[8], scatts[8], agrias[7], agoras[7], saigas[7], sargos[7], agitas[7], taigas[7], gratis[7], argots[7], gators[7], groats[7], griots[7], trigos[7], agists[7], staigs[7], grists[7], arista[6], raitas[6], riatas[6], tarsia[6], tiaras[6], aortas[6], aorist[6], aristo[6], ratios[6], satori[6], sistra[6], sitars[6], stairs[6], assort[6], roasts[6], tsoris[6], tatsoi[6], attars[6], strata[6], tatars[6], artist[6], strait[6], strati[6], traits[6], ottars[6], stator[6], tarots[6], tortas[6], stoats[6], toasts[6], starts[6]

5 letter words

cigar[8], cargo[8], corgi[8], orgic[8], crags[8], scrag[8], scags[8], acari[7], coria[7], sacra[7], orcas[7], coirs[7], casas[7], socas[7], crass[7], scars[7], cross[7], coati[7], carat[7], triac[7], actor[7], taroc[7], toric[7], ascot[7], coast[7], coats[7], costa[7], tacos[7], agria[6], agora[6], saiga[6], agios[6], agars[6], ragas[6], ragis[6], sargo[6], giros[6], sagas[6], sagos[6], grass[6], gross[6], agita[6], taiga[6], tragi[6], argot[6], gator[6], groat[6], griot[6], trigo[6], agist[6], gaits[6], staig[6], goats[6], togas[6], arias[5], raias[5], assai[5], oasis[5], ossia[5], arsis[5], saris[5], saros[5], soars[5], soras[5], atria[5], raita[5], riata[5], tiara[5], aorta[5], ratio[5]