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

15 letter words

vasoconstrictor[22]

12 letter words

constrictors[16]

11 letter words

contractors[15], constrictor[15], corotations[13], cartoonists[13]

10 letter words

vasotocins[15], contractor[14], contactors[14], constricts[14], corrasions[12], corrosions[12], sonicators[12], corotation[12], cartoonist[12], transistor[10]

9 letter words

vasotocin[14], vocations[14], occasions[13], coactions[13], narcotics[13], acrostics[13], contactor[13], contracts[13], constrict[13], trictracs[13], varistors[12], votarists[12], corrasion[11], corrosion[11], consortia[11], sonicator[11], carrotins[11], croissant[11], tractions[11], contrasts[11], oratorios[9], rotations[9], nitrators[9], ostinatos[9], strontias[9]

8 letter words

cavicorn[15], convicts[15], corvinas[13], vocation[13], occasion[12], raccoons[12], siroccos[12], coaction[12], cratonic[12], narcotic[12], acrostic[12], coactors[12], contract[12], trictrac[12], contacts[12], ovations[11], varistor[11], stotinov[11], votarist[11], carrions[10], narcosis[10], corsairs[10], carrotin[10], carotins[10], cortinas[10], cartoons[10], corantos[10], ostracon[10], crostino[10], tricorns[10], narcists[10], cistrons[10], consorts[10], traction[10], oscitant[10], tactions[10], citators[10], ricottas[10], contrast[10], strontic[10], contorts[10], tractors[10], astricts[10], oratorio[8], orations[8], arsonist[8], santoors[8], torsions[8], rotation[8], nitrator[8], ostinato[8], strontia[8], arnottos[8], rattoons[8], tortonis[8], traitors[8], rotators[8], stations[8], transits[8], risottos[8]

7 letter words

acronic[11], raccoon[11], cocains[11], cocoons[11], sirocco[11], rococos[11], ricracs[11], corsacs[11], acrotic[11], coactor[11], ocicats[11], arctics[11], accosts[11], contact[11], tactics[11], tictacs[11], tictocs[11], carrion[9], coronas[9], racoons[9], corsair[9], rancors[9], caisson[9], casinos[9], cassino[9], incross[9], carotin[9], cortina[9], cartoon[9], coranto[9], tricorn[9], actions[9], atonics[9], cations[9], narcist[9], cantors[9], cartons[9], contras[9], cratons[9], cistron[9], citrons[9], cortins[9], octrois[9], consort[9], crotons[9], carrots[9], trocars[9], scotias[9], consist[9], tocsins[9], nostocs[9], racists[9], sacrist[9], castors[9], costars[9], taction[9], tantric[9], citator[9], ricotta[9], contort[9], tractor[9], octants[9], cottons[9], astrict[9], cottars[9], tricots[9], statics[9], ariosos[7], orisons[7], oration[7], aroints[7], rations[7], ratoons[7], santoor[7], nitroso[7], torsion[7], orators[7], instars[7], santirs[7], strains[7], aorists[7], aristos[7], satoris[7], tsooris[7], ristras[7], sartors[7], arnotto[7], rattoon[7], tortoni[7], traitor[7], rotator[7], station[7], transit[7], attorns[7], rattons[7], intorts[7], tritons[7], risotto[7], statins[7]