The word overcrowding 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™ Plays In The Letters overcrowding
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Seven Letter Word Alert: (43 words)
cervoid, codrive, codrove, coowned, coowner, cording, coreign, corndog, cornier, cornrow, coroner, corrode, cringed, cringer, crooned, crooner, crowing, crowned, decrown, divorce, dooring, downier, eroding, grinder, groined, grooved, groover, ignored, negroid, overrid, recrown, redoing, regrind, regrown, rowdier, widgeon, woodier, wordier, wording, worried, wringer, wronged, wronger