The word demagnetizes 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: 28
Highest Scoring Words With Friends™ Play In The Letters demagnetizes
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Seven Letter Word Alert: (58 words)
aniseed, deeming, demates, demeans, dements, demesne, destain, destine, detains, diazene, edgiest, endgame, enemies, enigmas, gametes, gamiest, gatemen, inmates, instead, magnets, maidens, matinee, matings, maziest, meanest, meanies, medians, mediate, meeting, menages, midgets, mindset, mintage, misdate, negated, negates, sainted, seaming, seating, seeding, seeming, segment, sideman, sigmate, smidgen, sneezed, stained, standee, steamed, tandems, teaming, teasing, teazing, teeming, teenage, zaniest, zeatins, zesting