The word underplays 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: 19
Highest Scoring Words With Friends™ Play In The Letters underplays
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Seven Letter Word Alert: (33 words)
asunder, dyspnea, endplay, enlards, landers, launder, laundry, panders, parleys, parsley, perusal, planers, players, plenary, plunder, replans, replays, slander, slurped, snarled, sparely, splayed, splayer, sprayed, spurned, syruped, undrape, unlayer, unparse, unplays, unready, uplands, yaupers