use '?' for JOKER (blank)

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

11 letter words

castrations[13]

10 letter words

castration[12]

9 letter words

raincoats[11], cassation[11], sacristan[11], croissant[11], tractions[11], transacts[11], castratos[11], contrasts[11], strontias[9]

8 letter words

ocarinas[10], acrasins[10], sarcinas[10], narcosis[10], raincoat[10], carotins[10], cortinas[10], sacatons[10], narcists[10], cistrons[10], traction[10], oscitant[10], tactions[10], castrati[10], transact[10], castrato[10], citators[10], ricottas[10], contrast[10], strontic[10], astricts[10], artisans[8], tsarinas[8], arsonist[8], arnattos[8], strontia[8], satanist[8], stations[8], transits[8]

7 letter words

ocarina[9], acrasin[9], arnicas[9], carinas[9], sarcina[9], cassina[9], caisson[9], casinos[9], cassino[9], ascaris[9], incross[9], anticar[9], carotin[9], cortina[9], satanic[9], sacaton[9], actions[9], atonics[9], cations[9], caritas[9], narcist[9], ostraca[9], cantors[9], cartons[9], contras[9], cratons[9], cistron[9], citrons[9], cortins[9], casitas[9], scotias[9], consist[9], tocsins[9], racists[9], sacrist[9], castors[9], costars[9], taction[9], tantric[9], citator[9], ricotta[9], astatic[9], octants[9], astrict[9], cottars[9], tricots[9], statics[9], atonias[7], antiars[7], artisan[7], tsarina[7], aroints[7], rations[7], sonatas[7], aristas[7], tarsias[7], instars[7], santirs[7], strains[7], aorists[7], aristos[7], satoris[7], arnatto[7], attains[7], anattos[7], station[7], striata[7], rattans[7], tantras[7], tartans[7], transit[7], attorns[7], rattons[7], intorts[7], tritons[7], statins[7], tanists[7], tatsois[7], stotins[7], stratas[7], artists[7], straits[7], tsarist[7], stators[7]

6 letter words

acinar[8], arnica[8], carina[8], crania[8], casino[8], cairns[8], scoria[8], acorns[8], narcos[8], racons[8], orcins[8], cassia[8], cansos[8], scions[8], sonics[8], crasis[8], crissa[8], across[8], scorns[8], action[8], atonic[8], cation[8], aortic[8], cantor[8], carton[8], contra[8], craton[8], citron[8], cortin[8], casita[8], sancta[8], actins[8], antics[8], nastic[8], coatis[8], scotia[8], cantos[8], cotans[8], octans[8], tocsin[8], tonics[8], carats[8], crista[8], racist[8], triacs[8], actors[8], castor[8], costar[8], scrota[8], tarocs[8], nairas[6], arsino[6], norias[6], sansar[6], sarans[6], sarins[6], arsons[6], sonars[6], rosins[6], atonia[6], antiar[6], aroint[6], ration[6], sonata[6], arista[6], raitas[6], riatas[6], tarsia[6], tiaras[6], ratans[6], instar[6], santir[6], strain[6], trains[6], aortas[6], aorist[6]