The word tidewaters 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: 14
Highest Scoring Words With Friends™ Play In The Letters tidewaters
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Seven Letter Word Alert: (52 words)
aeriest, aridest, artiest, astride, attired, attires, dearest, dearies, dewater, dewiest, dewires, diester, dieters, disrate, iratest, iterate, readies, reasted, redates, reedits, resawed, restate, retaste, retwist, sedater, seriate, started, steward, strawed, strewed, striate, swatted, swatter, sweated, sweater, tarweed, tasered, tastier, testier, tirades, treated, twisted, twister, waisted, waiters, wariest, watered, wearied, wearies, wetters, witters, wrested