The word misbehaviours 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 misbehaviours
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Seven Letter Word Alert: (66 words)
abioses, abiosis, abusers, abusive, ambries, arouses, assumer, bariums, bashers, bearish, biomass, boarish, bohrium, bossier, bousier, braises, bravoes, bromise, bruises, brushes, bushier, erbiums, hassium, herbous, heroism, hissier, hombres, hosiers, imburse, isobars, isomers, ivories, marshes, mashers, masseur, massive, meiosis, messiah, misaver, mishear, misuser, mossier, mousers, mousier, mushers, mushier, ovaries, reshims, rhombus, riboses, saviors, saviour, savours, serious, shavers, shivers, shovers, siriema, smasher, sourish, surmise, various, verismo, verisms, vibrios, viruses