The word dreadnaughts 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: 20
Highest Scoring Words With Friends™ Plays In The Letters dreadnaughts
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Seven Letter Word Alert: (75 words)
agendas, anthers, argents, asunder, aurates, danders, dangers, dastard, daunted, dearths, desugar, dharnas, dragnet, draught, drudges, dustrag, eartags, ganders, gardens, garnets, gateaus, gathers, gaunted, gaunter, gnashed, gnasher, gradate, grandad, granted, grunted, guarded, gunters, handers, handset, hangars, hangers, hardens, hardest, hatreds, haunted, haunter, hundred, hungers, hunters, natured, natures, rehangs, saunter, shudder, shunted, shunter, snudged, stander, strange, sudated, sugared, tanager, teargas, threads, thunder, trashed, trudged, trudgen, trudges, tundras, undated, undrest, unearth, unhated, unheard, unrated, unsated, unshare, unstage, untread