The word waterings 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: 15
Highest Scoring Words With Friends™ Play In The Letters waterings
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Seven Letter Word Alert: (43 words)
aigrets, antsier, argents, earwigs, erasing, gainers, gaiters, garnets, gastrin, gnawers, granite, ingrate, nastier, ratings, regains, restain, resting, retains, retinas, searing, seating, stagier, stainer, staring, stewing, stinger, strange, tangier, tawnier, tearing, teasing, tinware, triages, twanger, twiners, twinges, waiters, wanters, wariest, wasting, wearing, wingers, winters