The word headstrong 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: 16
Highest Scoring Words With Friends™ Play In The Letters headstrong
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Seven Letter Word Alert: (57 words)
adhorns, another, anthers, argents, atoners, dangers, dearths, dehorns, dehorts, dogears, donates, dotages, dragnet, dragons, earshot, ganders, gardens, garnets, gathers, ghosted, gnashed, gnasher, godsent, granted, groaned, hadrons, hagrode, handers, handset, hangers, hardens, hardest, hatreds, headons, hornets, onstage, oranges, rehangs, roasted, rodents, sandhog, senator, shorted, shorten, snorted, stander, storage, strange, tangoed, thonged, thorned, threads, throned, thrones, throngs, trashed, treason