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

15 letter words

voicelessnesses[20]

13 letter words

voicelessness[18]

11 letter words

closenesses[13]

10 letter words

solvencies[15], evilnesses[13], livenesses[13], vilenesses[13], cosinesses[12], secessions[12], solenesses[10]

9 letter words

violences[14], voiceless[14], elevenses[12], novelises[12], licensees[11], colessees[11], isosceles[11], solecises[11], secession[11], closeness[11], selenoses[9], lionesses[9], noiseless[9], selenosis[9], senseless[9]

8 letter words

violence[13], clevises[13], vesicles[13], viceless[13], viscoses[13], novelise[11], evilness[11], liveness[11], veinless[11], vileness[11], licensee[10], cineoles[10], licenses[10], silences[10], colessee[10], solecise[10], senecios[10], encloses[10], incloses[10], ecesises[10], essences[10], ossicles[10], cessions[10], cosiness[10], enosises[8], noesises[8], noseless[8], soleness[8], sessions[8]

7 letter words

vesicle[12], evinces[12], novices[12], viscose[12], elevens[10], elevons[10], sleeves[10], slieves[10], snivels[10], slovens[10], vessels[10], cineole[9], license[9], selenic[9], silence[9], senecio[9], enclose[9], cineols[9], inclose[9], iceless[9], essence[9], ossicle[9], cession[9], cosines[9], oscines[9], oleines[7], enisles[7], ensiles[7], seniles[7], eosines[7], insoles[7], lesions[7], lioness[7], lessees[7], sessile[7], senseis[7], lessens[7], sinless[7], loesses[7], essoins[7], osseins[7], session[7], lessons[7], sonless[7]

6 letter words

evince[11], veloce[11], novice[11], cloven[11], clevis[11], voices[11], cloves[11], covens[11], covins[11], eleven[9], elevon[9], levees[9], sleeve[9], levies[9], slieve[9], envies[9], nieves[9], levins[9], livens[9], snivel[9], olives[9], voiles[9], venose[9], envois[9], ovines[9], novels[9], sloven[9], sieves[9], selves[9], vessel[9], sevens[9], solves[9], eocene[8], cineol[8], enolic[8], nieces[8], clines[8], colies[8], conies[8], cosine[8], icones[8], oscine[8], clones[8], colins[8], nicols[8], ecesis[8], slices[8], censes[8], scenes[8], cosies[8], closes[8], socles[8], scones[8], scions[8], sonics[8], cesses[8], oleine[6], enisle[6], ensile[6], senile[6], eosine[6], leones[6], eloins[6], insole[6], lesion[6], oleins[6], lessee[6], seines[6], sensei[6], lenses[6], lessen[6], enosis[6], eosins[6], essoin[6], noesis[6], noises[6], ossein[6], sonsie[6], lesson[6], seises[6], nesses[6], senses[6], losses[6], sisses[6]

5 letter words

niece[7], cline[7], oleic[7], clone[7], colin[7], nicol[7], ceils[7], slice[7], cense[7], scene[7], cines[7], since[7], leone[5], eloin[5], olein[5], seine[5], lenes[5], lense[5]