The word devitalised 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: (31 words)
advised, advisee, aediles, avidest, dailies, daisied, deadest, deities, delated, delates, deleads, details, deviate, deviled, devisal, devised, dieties, dilated, dilates, divides, elative, estival, evilest, ilvaite, laddies, liaised, sedated, sidelit, teddies, valeted, visited