The word deleterious 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: 14
Highest Scoring Words With Friends™ Plays In The Letters deleterious
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Seven Letter Word Alert: (61 words)
deerlet, deleter, deletes, delouse, detours, diester, dieters, diluter, dilutes, duelers, duelist, dustier, editors, eeriest, eluders, elutors, erotise, erudite, estriol, eustele, ioduret, leisure, loiters, loudest, lousier, lustier, oilseed, outlier, outlies, outride, outside, reedits, reested, reoiled, residue, resoled, retiled, retiles, roisted, roselet, rudites, rustled, rutiles, seedier, sleeted, soldier, sortied, steeled, steelie, steered, sterile, steroid, storied, stourie, strudel, studier, tedious, tierods, toilers, toluide, tousled