The word dematerialize 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: 27
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (51 words)
admiral, aerated, airdate, airmail, airtime, alarmed, alerted, altered, azimide, dealate, deerlet, deleter, delimit, deliria, demerit, dilater, dimeter, ditzier, emailed, emerald, emirate, itemize, limeade, limited, limiter, maleate, maltier, marital, marlite, martial, mealier, meatier, mediate, merited, metaled, metered, metrize, militar, mitered, radiate, readmit, realize, redealt, related, remated, retiled, retimed, tiaraed, timider, trailed, treadle