The word underbosses 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: 17
Highest Scoring Words With Friends™ Plays In The Letters underbosses
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Seven Letter Word Alert: (38 words)
bedress, bedsore, benders, bonuses, boreens, bounder, burdens, deboner, debones, debuses, dousers, dresses, enbused, enbuses, endorse, endures, enrobed, enrobes, ensured, ensures, rebonds, rebound, redness, resends, resnubs, resound, rosebud, senders, sensors, sobered, sounder, subnode, sudsers, sunbeds, undoers, undress, unrobed, unrobes