The word attenuators 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: 13
Highest Scoring Words With Friends™ Plays In The Letters attenuators
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Seven Letter Word Alert: (37 words)
astuter, atoners, attunes, aurates, entrust, natters, natures, nutters, outearn, outrant, outrate, rattons, retoast, rotates, saunter, senator, snotter, stature, statute, stouter, stunter, stutter, tartans, tartest, tatters, taunter, tautens, tautest, tetanus, teutons, toaster, tonsure, totters, touters, treason, truants, urostea