The word overwinters 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: 19
Highest Scoring Words With Friends™ Play In The Letters overwinters
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Seven Letter Word Alert: (62 words)
entries, enviers, erosive, erotise, estrone, inerter, inverse, inverts, ironers, nervier, newsier, norites, orients, overset, oversew, oversit, overwet, reinter, renters, rerents, rerinse, restive, restore, reswore, retires, retries, retwine, reverts, reviews, reviser, revotes, rewires, rewoven, rewrite, rewrote, rioters, riveter, roister, sievert, snorter, snowier, sterner, stonier, striven, striver, swerver, trienes, triones, twiners, twonies, versine, version, vetoers, viewers, voteens, weiners, western, wieners, winters, worries, wrester, writers