The word misbehaviour 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™ Play In The Letters misbehaviour
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Seven Letter Word Alert: (27 words)
abusive, ambries, bariums, bearish, boarish, bohrium, bousier, bravoes, bromise, bushier, erbiums, herbous, heroism, hombres, imburse, ivories, misaver, mishear, mousier, mushier, ovaries, rhombus, saviour, siriema, various, verismo, vibrios