The word misbehaviors 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: 24
Highest Scoring Words With Friends™ Play In The Letters misbehaviors
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Seven Letter Word Alert: (38 words)
abioses, abiosis, ambries, bashers, bearish, biomass, boarish, bossier, braises, bravoes, bromise, heroism, hissier, hombres, hosiers, isobars, isomers, ivories, marshes, mashers, massive, meiosis, messiah, misaver, mishear, mossier, ovaries, reshims, riboses, saviors, shavers, shivers, shovers, siriema, smasher, verismo, verisms, vibrios