The word vigilantes is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 18
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (50 words)
aiglets, aisling, anglist, elastin, elating, entails, estival, eviting, gelatin, genials, genital, glisten, ignites, ilvaite, intagli, invites, lasting, leasing, leaving, ligates, lignite, listing, livings, nailset, naivest, natives, sailing, salient, salting, salving, sealing, seating, sieving, silting, singlet, slating, slaving, staving, stiving, tagline, tailing, tangles, teasing, tilings, tingles, vainest, veiling, vesting, vialing, vintage