The word serialised 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: 12
Highest Scoring Words With Friends™ Play In The Letters serialised
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Seven Letter Word Alert: (36 words)
aediles, aidless, airless, airside, dailies, dairies, daisies, dealers, dearies, deliria, derails, desires, dialers, diaries, diesels, disease, earless, eldress, leaders, leasers, liaised, liaises, readies, realise, redeals, redials, resails, resales, reseals, resides, sailers, sealers, seaside, serials, sidlers, sliders