The word overstayed 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: 17
Highest Scoring Words With Friends™ Plays In The Letters overstayed
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Seven Letter Word Alert: (27 words)
adverse, adverts, averted, dearest, destroy, devotes, evaders, overate, overdye, overeat, oversat, oversea, overset, reasted, redates, resaved, revoted, revotes, roasted, roseate, savored, sedater, starved, strayed, tasered, vetoers, yeasted