The word predeceases 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 predeceases
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Seven Letter Word Alert: (37 words)
asperse, capered, creased, creases, creeped, decares, decease, decrees, deepsea, depress, escaped, escapee, escaper, escapes, escarps, parsecs, precede, pressed, recedes, repaced, repaces, reseeds, respace, respade, scarped, scraped, scrapes, screeds, seceder, secedes, seeders, serapes, spacers, spaders, speared, speeder, spreads