The word diagonalised 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: 18
Highest Scoring Words With Friends™ Play In The Letters diagonalised
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Seven Letter Word Alert: (73 words)
addling, adenoid, adonise, aeolian, agendas, agnosia, agonies, agonise, aisling, aliased, alidade, alidads, aligned, analogs, angioid, anilide, anodise, dailies, daisied, dandies, dandles, dangled, dangles, dealign, dealing, denials, dialing, dialogs, dildoes, dingies, disdain, dogsled, doilies, eliding, elision, eloigns, galenas, genials, geoidal, gladden, goalies, godsend, goldens, gonadal, idolise, indigos, indoles, iodides, iodines, iodised, ionised, laddies, ladings, lasagne, leading, leasing, legions, liaised, liaison, ligands, lingoes, lionise, loading, sailing, sealing, sealion, sidling, singled, slanged, sliding, snailed, sodding, soiling