The word thoroughness 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 thoroughness
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Seven Letter Word Alert: (51 words)
engross, estrous, grouses, gunshot, gunters, gushers, honours, hornets, hotness, hungers, hunters, hushers, noosers, oestrus, onerous, onshore, oogenus, orogens, osteons, ousters, outgoes, reshoot, roughen, shoguns, shooter, shorten, shotgun, shouter, shunter, sooners, soonest, soother, soothes, sorghos, sourest, stoners, stooges, surgeon, tensors, thrones, throngs, through, tongues, tonsure, toruses, toughen, tougher, troughs, unhorse, unrests, unsorts