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

15 letter words

voraciousnesses[20]

13 letter words

overissuances[18], veraciousness[18], voraciousness[18], variousnesses[16]

12 letter words

overissuance[17], scurvinesses[17], savorinesses[15]

11 letter words

oncoviruses[16], cursiveness[16], viscousness[16], variousness[14], suasiveness[14], scarinesses[13], saucinesses[13], narcissuses[13], seriousness[11]

10 letter words

coversines[15], oversauces[15], scurviness[15], savoriness[13], overissues[13], racinesses[12], coarseness[12], recessions[12], cosinesses[12], secessions[12], censorious[12], rosinesses[10], sournesses[10]

9 letter words

veronicas[14], coversine[14], ascensive[14], caressive[14], varicoses[14], conserves[14], converses[14], conversos[14], crevasses[14], vinaceous[14], oversauce[14], veracious[14], cavernous[14], voracious[14], oncovirus[14], aversions[12], eversions[12], universes[12], savouries[12], overissue[12], souvenirs[12], suaveness[12], voussoirs[12], increases[11], scenarios[11], recession[11], secession[11], ancresses[11], scariness[11], incrosses[11], crassness[11], crossness[11], cinereous[11], causeries[11], sinecures[11], sericeous[11], coinsures[11], rosaceous[11], issuances[11], sauciness[11], surceases[11], cuirasses[11], narcissus[11], uncrosses[11], scissures[11], reseasons[9], seasoners[9], sorosises[9], arsenious[9], ossuaries[9]

8 letter words

veronica[13], overnice[13], covaries[13], varicose[13], revoices[13], conserve[13], converse[13], corvinas[13], converso[13], crevasse[13], scrieves[13], services[13], viscoses[13], unvoices[13], incurves[13], uncovers[13], cursives[13], scurvies[13], aversion[11], eversion[11], evasions[11], inverses[11], versines[11], overseas[11], savories[11], versions[11], vinasses[11], universe[11], ravenous[11], souvenir[11], overuses[11], saviours[11], savorous[11], voussoir[11], increase[10], scenario[10], senecios[10], conioses[10], casernes[10], arcsines[10], arsenics[10], raciness[10], scariose[10], coarsens[10], narcoses[10], necroses[10], narcosis[10], necrosis[10], cassenes[10], cassines[10], caseoses[10], caissons[10], cassinos[10], cessions[10], cosiness[10], caresses[10], cassises[10], scissors[10], eucaines[10], causerie[10], insecure[10], sinecure[10], nacreous[10], coenures[10], coinsure[10], canorous[10], corneous[10], issuance[10], surcease[10], sauciers[10], censures[10], carouses[10], scarious[10], cornuses[10], censuses[10], sucrases[10], scissure[10], sucroses[10], reseason[8], seasoner[8], erasions[8], sensoria[8], erosions[8], easiness[8], enosises[8], noesises[8], soreness[8], rosiness[8], sessions[8], reassess[8], assessor[8], uneasier[8], anureses[8], anuresis[8], senarius[8], enuresis[8], anserous[8], arsenous[8], neuroses[8], neurosis[8], resinous[8], arsonous[8], rosinous[8], suasions[8], reissues[8], seisures[8], sureness[8], sunrises[8], sourness[8]

7 letter words

coronae[9], acinose[9], senecio[9], careens[9], caserne[9], recanes[9], arcsine[9], arsenic[9], carnies[9], sincere[9], acerose[9]