The word overwintered 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™ Play In The Letters overwintered
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Seven Letter Word Alert: (49 words)
deriver, dernier, devotee, downier, entered, enterer, everted, evident, inerter, needier, nerdier, nervier, oreweed, overrid, overwet, redrive, reedier, reendow, reenter, reinter, renerve, renewed, renewer, retired, retiree, retreed, retried, retwine, revered, reverie, revoted, rewired, rewoven, rewrite, rewrote, rivered, riveted, riveter, rowdier, teenier, tireder, towered, weedier, weenier, weirder, widener, wordier, wordnet, worried