The word demineralize 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™ Plays In The Letters demineralize
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Seven Letter Word Alert: (31 words)
airline, amender, anilide, azimide, deliria, denarii, diamine, diazene, diazine, eleidin, emailed, emendal, emender, emerald, learned, limeade, mandrel, mandril, manlier, mealier, meander, midline, mineral, needier, needler, realize, reamend, redline, relined, remined, renamed