The word antidiuretic 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: 18
Highest Scoring Words With Friends™ Play In The Letters antidiuretic
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Seven Letter Word Alert: (56 words)
attired, attuned, cairned, cantred, cattier, centaur, certain, citrate, citrine, cittern, curated, curtain, cutrate, denarii, detract, detrain, dictate, incited, inciter, inditer, inducer, inertia, intrude, nattier, natured, nictate, nitrate, nitride, nitrite, nittier, nuttier, reaudit, tainted, tantric, taunted, taunter, tetanic, tintier, titanic, tradein, traduce, traduct, trained, tranced, triadic, trident, unaired, uncared, uncited, uncrate, unrated, untired, untread, untried, uridine, urinate