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From letters V, A, S, C, U, L, A, R, I, Z, A, T, I, O, N  I made following words

15 letter words

vascularization[28]

11 letter words

variational[14]

10 letter words

clavations[15], vicariants[15], naviculars[15], avaricious[15], salivation[13], variations[13], valuations[13], antisocial[12], scarlatina[12], alacritous[12], arcuations[12], ultrasonic[12], sinoatrial[10], saturnalia[10]

9 letter words

zirconias[19], alizarins[17], azoturias[17], calvarian[14], calvarias[14], carnivals[14], vaticinal[14], clavation[14], vicariant[14], covariant[14], viaticals[14], cavatinas[14], vacations[14], victorias[14], slavocrat[14], navicular[14], involucra[14], univocals[14], avascular[14], vicarious[14], outcavils[14], cultivars[14], virtuosic[14], antiviral[12], variation[12], aviations[12], lavations[12], salvation[12], salivator[12], valuation[12], antivirus[12], valuators[12], outrivals[12], cantorial[11], lictorian[11], satanical[11], scalation[11], racialist[11], satirical[11], raincoats[11], cilantros[11], contrails[11], triclosan[11], lacunaria[11], casuarina[11], actuarial[11], auctorial[11], arcuation[11], causation[11], suctional[11], sulcation[11], cuisinart[11], ocularist[11], suctorial[11], suctorian[11], calutrons[11], construal[11], sanitaria[9], artisanal[9], sanatoria[9], sanitoria[9], antisolar[9], rationals[9], insulator[9]

8 letter words

zirconia[18], alcazars[18], czarinas[18], stanzaic[18], zacatons[18], alizarin[16], tzarinas[16], triazins[16], azoturia[16], calvaria[13], vicarial[13], carnival[13], avionics[13], caravans[13], corvinas[13], viatical[13], cavatina[13], vacation[13], victoria[13], vortical[13], vocalist[13], univocal[13], avicular[13], vacuolar[13], vascular[13], outcavil[13], cultivar[13], victuals[13], viscount[13], valonias[11], visional[11], variolas[11], raviolis[11], aviation[11], lavation[11], valiants[11], aviarist[11], travails[11], variants[11], vitrains[11], aviators[11], ovaritis[11], vitriols[11], anovular[11], avulsion[11], valuator[11], outrival[11], volutins[11], virtuosa[11], virtuosi[11], ironical[10], ocarinas[10], clarions[10], iatrical[10], raincoat[10], cilantro[10], contrail[10], nitrolic[10], actinias[10], cantalas[10], santalic[10], colistin[10], aoristic[10], clitoris[10], coistril[10], carotins[10], cortinas[10], crostini[10], unsocial[10], lacunars[10], cislunar[10], carousal[10], consular[10], courlans[10], nautical[10], uralitic[10], uranitic[10], calutron[10], lunatics[10], sultanic[10], auctions[10], cautions[10], osculant[10], linocuts[10], claustra[10], curtails[10], rustical[10], curtains[10], courants[10], ructions[10], orinasal[8], notarial[8], rational[8], alations[8], salariat[8], intarsia[8], tonsilar[8], silurian[8], naturals[8], rainouts[8]

7 letter words

carinal[9], cranial[9], ocarina[9], clarion[9], incisal[9], salicin[9], asocial[9], canolas[9], alnicos[9], oilcans[9], silicon[9], acrasia[9], acrasin[9], arnicas[9], carinas[9], sarcina[9], carlins[9], incisor[9], liaison[7], solaria[7]