The word dreadnought 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™ Play In The Letters dreadnought
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Seven Letter Word Alert: (55 words)
adorned, aground, another, daunted, donated, dragnet, draught, drought, gaunted, gaunter, godhead, granted, groaned, grouted, grunted, guarded, guerdon, hagrode, handout, hangout, haunted, haunter, hoarded, hounded, hundred, natured, outdare, outdrag, outearn, outrage, outread, readout, redound, rotunda, roughed, roughen, rounded, tangoed, thonged, thorned, throned, thunder, tongued, toughen, tougher, trodden, trudged, trudgen, undated, undergo, unearth, unhated, unheard, unrated, untread