The word overplaying 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: 24
Highest Scoring Words With Friends™ Plays In The Letters overplaying
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Seven Letter Word Alert: (46 words)
aileron, aligner, angrily, apogeny, eloping, gravely, inlayer, ironage, layover, leaping, learing, leaving, levying, naively, olivary, opaline, orangey, overlap, overlay, overpay, ovinely, pealing, pergola, pingler, plainer, playing, plenary, plovery, praline, praying, prevail, preying, progeny, proline, pronely, proving, realign, reaping, reaving, relying, varying, vearing, vinegar, voyager, yealing, yelping