The word devitalizing 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: 30
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (39 words)
aligned, anilide, anviled, dealign, dealing, deaving, delving, deviant, dialing, diazine, dieting, digital, editing, elating, eliding, evading, eviting, gelatin, genital, glinted, glitzed, ignited, ilvaite, initial, intagli, invalid, invited, leading, leaving, ligated, lignite, tagline, tailing, tangled, teazing, tingled, veiling, vialing, vintage