The word vindictiveness 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: 28
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (55 words)
deceits, deistic, deities, densest, dentine, dentins, descent, destine, deveins, devests, devices, devises, diciest, dietics, dieties, dietine, dissect, dissent, divests, divines, divvies, eidetic, endives, enticed, entices, evicted, evident, evinced, evinces, iciness, incense, incests, incised, incises, incited, incites, indents, indices, indicts, indites, insects, insides, intends, intense, invects, invents, invests, invited, invitee, invites, scented, seitens, sestine, snidest, visited