The word underexposes 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: 25
Highest Scoring Words With Friends™ Plays In The Letters underexposes
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Seven Letter Word Alert: (55 words)
deepens, depones, deposer, deposes, depress, desexes, dousers, dressup, endorse, endures, ensured, ensures, espouse, expends, expense, exposed, exposer, exposes, expound, express, needers, openers, persons, perused, peruses, ponders, poseurs, pounder, preened, pressed, redness, reopens, reposed, reposes, reseeds, resends, resound, respond, seeders, senders, sneered, sounder, speeder, spender, spondee, spoused, spurned, supered, suspend, undoers, undress, unposed, unsexed, xeroses, xeruses