The word underpasses 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 underpasses
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Seven Letter Word Alert: (44 words)
asepses, asperse, assured, assures, asunder, depress, dresses, dressup, endears, endures, ensears, ensured, ensures, eupneas, panders, passers, perused, peruses, pressed, presses, redness, resands, resends, resnaps, respade, respans, sadness, sanders, senders, serapes, spaders, speared, spender, spreads, spurned, sudsers, sundaes, supered, surpass, suspend, undrape, undress, unparse, ureases