The word prepubescent 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: 26
Highest Scoring Words With Friends™ Play In The Letters prepubescent
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Seven Letter Word Alert: (41 words)
becrust, beepers, butenes, censure, centers, centres, crubeen, cuprene, encrust, entrees, neuters, pectens, peepers, percent, percept, precent, precept, precuts, prepuce, present, preteen, punster, punters, repents, respect, retunes, scenter, scepter, sceptre, secrete, serpent, specter, spectre, steepen, steeper, stepper, subtree, tenures, terpene, unerect, unreset