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

9 letter words

vasectomy[19]

7 letter words

avocets[12], octaves[12], comates[11]

6 letter words

coveys[14], cymose[13], vamose[11], avocet[11], octave[11], covets[11], mateys[11], mayest[11], steamy[11], coyest[11], cameos[10], comate[10], mascot[10], comets[10], comtes[10], avoset[9], costae[8]

5 letter words

covey[13], cymae[12], cymas[12], cymes[12], savoy[11], vasty[11], caves[10], coves[10], voces[10], moves[10], covet[10], seamy[10], cosey[10], mayos[10], mosey[10], etyma[10], matey[10], meaty[10], atomy[10], motey[10], mayst[10], cameo[9], comae[9], acmes[9], cames[9], maces[9], camos[9], comas[9], comes[9], comet[9], comte[9], oaves[8], soave[8], ovate[8], stave[8], vesta[8], stove[8], votes[8], yeast[8], caste[7], cates[7], cesta[7], taces[7], mates[7], meats[7], satem[7], steam[7], tames[7], teams[7], ascot[7], coast[7], coats[7], costa[7], tacos[7], coset[7], cotes[7], escot[7], atoms[7], moats[7], stoma[7], moste[7], motes[7], smote[7], tomes[7], stoae[5], toeas[5]

4 letter words

cavy[12], cyma[11], cyme[11], mycs[11], cave[9], cove[9], move[9], vacs[9], mayo[9], cays[9], syce[9], mays[9], yams[9], cosy[9], coys[9], cyst[9], acme[8], came[8], mace[8], camo[8], coma[8], come[8], cams[8], macs[8], scam[8], mocs[8], aves[7], save[7], vase[7], avos[7], voes[7], veto[7], vote[7], tavs[7], vast[7], vats[7], vest[7], vets[7], ayes[7], easy[7], eyas[7], yeas[7], soya[7], oyes[7], stay[7], stey[7], stye[7], tyes[7], toys[7], aces[6], case[6], maes[6], mesa[6], same[6], seam[6], ocas[6], soca[6], moas[6], soma[6], some[6], cate[6], tace[6], mate[6], meat[6], meta[6], tame[6], team[6], coat[6], taco[6], cote[6], atom[6], moat[6], mote[6], tome[6], acts[6], cast[6], cats[6], scat[6], sect[6], mast[6], mats[6], tams[6], stem[6], cost[6], cots[6], scot[6], most[6], mots[6], toms[6], toea[4], ates[4], east[4], eats[4], etas[4], sate[4], seat[4], seta[4], teas[4], oast[4], oats[4], stoa[4], taos[4], toes[4]

3 letter words

cam[7], mac[7], moc[7], ace[5], mae[5], oca[5], moa[5], sac[5], sae[3], sea[3]