The word ghostwriters 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: 19
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (59 words)
egoists, egotist, ghettos, goiters, goitres, goriest, gothite, grister, gritter, grosser, growers, growths, hitters, hogties, horsier, hosiers, ogreish, regrows, reshows, resight, resorts, restirs, rethrow, retorts, retwist, rhetors, righter, rioters, roister, rosiest, rosters, rotters, shorter, showers, showier, sighers, sighter, sitters, sorters, sorties, stogies, stories, swisher, theists, thirsts, thorite, thrower, tighter, tigress, tithers, twister, weights, whitest, wishers, withers, witters, worries, writers, writhes