The word diagonalizes 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: 26
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (70 words)
adonise, adonize, aeolian, agendas, agnosia, agonies, agonise, agonize, aisling, aliased, aligned, analogs, angioid, anilide, anodise, anodize, dailies, dangles, dealign, dealing, denials, dialing, dialogs, diazane, diazine, diazole, dingies, doilies, eliding, elision, eloigns, galenas, genials, geoidal, goalies, goldens, gonadal, idolise, idolize, indigos, indoles, iodines, iodizes, ionised, ionized, ionizes, ladings, lasagne, leading, leasing, legions, liaised, liaison, ligands, lingoes, lionise, lionize, loading, ozalids, sailing, sealing, sealion, seizing, sidling, singled, slanged, sliding, snailed, soiling, zenaida