The word blackwaters 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: 25
Highest Scoring Words With Friends™ Play In The Letters blackwaters
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Seven Letter Word Alert: (44 words)
abaters, ablates, abreact, abreast, acaters, actable, arblast, awakest, backers, backsaw, balkers, becrawl, blacker, blaster, bracket, cabaret, cablers, cartels, catwalk, clarets, clawers, lactase, rackets, rebacks, reblast, restack, retacks, rewalks, sawback, scarlet, setback, slacker, stabler, stacker, stalker, tackers, tackler, tackles, talkers, taskbar, walkers, warbles, warblet, webcast