The word ghostwriter 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™ Plays In The Letters
Seven Letter Word Alert: (39 words)
egotist, ghettos, goiters, goitres, goriest, gothite, grister, gritter, growers, growths, hitters, hogties, horsier, ogreish, regrows, resight, rethrow, retorts, retwist, rhetors, righter, rioters, roister, rotters, shorter, showier, sighter, thorite, thrower, tighter, tithers, twister, weights, whitest, withers, witters, worries, writers, writhes