The word heterodyning 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: 21
Highest Scoring Words With Friends™ Plays In The Letters heterodyning
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Seven Letter Word Alert: (52 words)
dentine, denting, denying, dienyne, diether, diynone, doyenne, droning, eighter, endnote, endogen, engined, eroding, grinned, groined, heeding, herding, heroine, hogtied, honeyed, hygiene, ignored, integer, intoned, intoner, needing, negroid, neighed, neither, nitrene, nondiet, nothing, redoing, rehinge, rehoned, reigned, rending, renting, retying, righted, tending, therein, thereon, thinned, thinner, thonged, thorned, throned, thyroid, tindery, tinhorn, treeing