The word derailment 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: 16
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (61 words)
ailment, alerted, aliment, altered, amender, arenite, demerit, detrain, dilater, dimeter, emailed, emendal, emerald, emirate, enteral, eternal, latrine, learned, lenited, limeade, lineate, maltier, mandrel, mandril, manlier, mantled, marlite, matinee, mealier, meander, meatier, mediate, merited, metaled, minaret, mineral, mitered, netmail, raiment, ratline, readmit, reamend, redealt, redline, related, reliant, relined, remated, remined, renamed, retiled, retimed, retinal, tendril, tradein, trailed, trained, trainee, treadle, trenail, triaene