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

15 letter words

vivaciousnesses[23]

13 letter words

vivaciousness[21], viciousnesses[18]

11 letter words

savvinesses[17], viciousness[16], viscousness[16], suasiveness[14], saucinesses[13]

10 letter words

cosinesses[12], secessions[12]

9 letter words

vivacious[17], savviness[15], vesuvians[15], ascensive[14], vinaceous[14], suaveness[12], icinesses[11], secession[11], scissions[11], issuances[11], sauciness[11]

8 letter words

evincive[16], invasive[14], vesuvian[14], avionics[13], invoices[13], viscoses[13], unvoices[13], evasions[11], vinasses[11], senecios[10], cassenes[10], cassines[10], caseoses[10], caissons[10], cassinos[10], cessions[10], cosiness[10], scission[10], cassises[10], eucaines[10], issuance[10], cuisines[10], censuses[10], easiness[8], enosises[8], noesises[8], sessions[8], suasions[8]

7 letter words

vivaces[15], civvies[15], evasive[13], navvies[13], savvies[13], avionic[12], invoice[12], vesicae[12], evinces[12], novices[12], ovisacs[12], viscose[12], unvoice[12], vicunas[12], vicious[12], viscous[12], evasion[10], avenses[10], savines[10], vinasse[10], visions[10], avenues[10], envious[10], niveous[10], suasive[10], venuses[10], acinose[9], senecio[9], eosinic[9], nicoise[9], cassene[9], encases[9], seances[9], senecas[9], caseins[9], cassine[9], incases[9], iciness[9], incises[9], caseose[9], caisson[9], casinos[9], cassino[9], cession[9], cosines[9], oscines[9], asceses[9], ascesis[9], cissies[9], eucaine[9], cuisine[9], acinous[9], uncases[9], usances[9], incuses[9], caseous[9], cousins[9], cuisses[9], scouses[9], eosines[7], ionises[7], sanseis[7], senseis[7], seisins[7], seasons[7], essoins[7], osseins[7], session[7], sassies[7], sissies[7], aeneous[7], uneases[7], sanious[7], suasion[7], sinuses[7]

6 letter words

aeonic[8], encase[8], seance[8], seneca[8], casein[8], incase[8], nieces[8], anisic[8], casini[8], incise[8], canoes[8], oceans[8], casino[8], conies[8], cosine[8], icones[8], oscine[8], ionics[8], ceases[8], saices[8], ecesis[8], scenas[8], censes[8], scenes[8], cosies[8], cansos[8], scones[8], scions[8], sonics[8], cesses[8], cassis[8], unciae[8], uncase[8], usance[8], acinus[8], incuse[8], ounces[8], cousin[8], causes[8], sauces[8], cuisse[8], census[8], scouse[8], eosine[6], ionise[6], easies[6], anises[6], sanies[6], sansei[6], seines[6], sensei[6], niseis[6], seisin[6], season[6], enosis[6], eosins[6], essoin[6], noesis[6], noises[6], ossein[6], sonsie[6], seises[6], isseis[6], nesses[6], senses[6], sasins[6], assess[6], sasses[6], sisses[6], aeneus[6], unease[6], anuses[6], usneas[6], ensues[6], nouses[6], onuses[6]