The word predeceased 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: 19
Highest Scoring Words With Friends™ Play In The Letters predeceased
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Seven Letter Word Alert: (27 words)
capered, creased, creeped, decades, decares, decease, decreed, decrees, deepsea, escaped, escapee, escaper, padders, precede, receded, recedes, repaced, repaces, respace, respade, scarped, scraped, seceded, seceder, speared, speeded, speeder