The word whitewaters 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™ Plays In The Letters whitewaters
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Seven Letter Word Alert: (48 words)
aeriest, artiest, atheise, atheist, attires, hastier, hatters, heaters, hitters, iratest, iterate, rattish, reheats, restate, retaste, rethaws, retwist, seriate, shatter, striate, swatter, sweater, tartish, tastier, testier, tethers, theater, theatre, thereat, threats, thwarts, tithers, twister, waiters, wariest, wearies, wearish, weather, wetters, whereas, whereat, whitest, withers, witters, wraiths, wreathe, wreaths, writhes