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From letters A, S, S, O, C, I, A, T, I, V, I, T, I, E, S  I made following words

15 letter words

associativities[20]

11 letter words

associative[16], viscosities[16]

10 letter words

activities[15], associates[12], isostacies[12]

9 letter words

activates[14], cavitates[14], atavistic[14], activists[14], assistive[12], vastities[12], associate[11], seacoasts[11], isostatic[11]

8 letter words

viscoses[13], cavities[13], activate[13], cavitate[13], activist[13], cavettos[13], vitiates[11], atavists[11], statives[11], vastiest[11], seacoast[10], coassist[10], osteitic[10], statices[10], scotties[10], satiates[8], osteitis[8], otitises[8]

7 letter words

ovisacs[12], viscose[12], aviatic[12], viatica[12], caveats[12], vacates[12], actives[12], avocets[12], octaves[12], costive[12], cavetti[12], cavetto[12], aviates[10], savates[10], avosets[10], soviets[10], vitiate[10], atavist[10], stative[10], ottavas[10], vastest[10], cassias[9], ascesis[9], cissies[9], casitas[9], ascites[9], ectasis[9], scotias[9], cosiest[9], cossets[9], astatic[9], catties[9], statice[9], costate[9], scottie[9], stactes[9], statics[9], siestas[7], tassies[7], satiate[7], tatsois[7], tassets[7]

6 letter words

cavies[11], vesica[11], civies[11], ovisac[11], voices[11], caveat[11], vacate[11], atavic[11], active[11], viatic[11], avocet[11], octave[11], civets[11], evicts[11], covets[11], soaves[9], avisos[9], aviate[9], savate[9], avoset[9], soviet[9], staves[9], vestas[9], vistas[9], visits[9], stoves[9], vittae[9], ottava[9], cassia[8], saices[8], cosies[8], cassis[8], casita[8], cities[8], iciest[8], costae[8], coatis[8], scotia[8], cestoi[8], castes[8], cestas[8], ascots[8], coasts[8], cestos[8], cosets[8], cosset[8], escots[8], stoics[8], cattie[8], cottae[8], otitic[8], stacte[8], attics[8], static[8], cottas[8], octets[8], scatts[8], assais[6], isseis[6], siesta[6], tassie[6], assets[6], stases[6], tasses[6], assist[6], stasis[6], tosses[6], tatsoi[6], otitis[6], states[6], tasset[6], tastes[6], testis[6], stoats[6], toasts[6]

5 letter words

aecia[7], saice[7], cosie[7], casas[7], cases[7], sices[7], socas[7], coses[7], aceta[7], coati[7], caste[7], cates[7], cesta[7], taces[7], cesti[7], cites[7], ascot[7], coast[7], coats[7], costa[7], tacos[7], coset[7], cotes[7], escot[7], stoic[7], casts[7], scats[7], sects[7], cists[7], assai[5], issei[5], oases[5], oasis[5], ossia[5], asses[5], sises[5], stoae[5], toeas[5], iotas[5], ostia[5], stoai[5], asset[5], easts[5], sates[5], seats[5], tasse[5], satis[5], sites[5], sties[5], oasts[5]