The word demyelinated 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: 21
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (40 words)
ailment, aliment, amended, amenity, amylene, anytime, dandily, daytide, daytime, deadeye, deadmen, delated, delayed, deleted, delimed, demated, dilated, dyeline, element, emailed, emendal, emended, laytime, lenited, limeade, lineate, lyddite, mantled, matinee, meatily, mediate, metaled, midland, myeline, needily, needled, netmail, tiddley, yealmed, yielded