The word diagonalized 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 diagonalized
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Seven Letter Word Alert: (29 words)
addling, adenoid, adonize, aeolian, agonize, alidade, aligned, angioid, anilide, anodize, dangled, dealign, dealing, dialing, diazane, diazide, diazine, diazole, eliding, geoidal, gladden, gonadal, idolize, iodized, ionized, leading, lionize, loading, zenaida