The word hyperactivity 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: 29
Highest Scoring Words With Friends™ Plays In The Letters hyperactivity
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Seven Letter Word Alert: (30 words)
activer, archive, captive, cattery, cattier, chapter, charity, chatter, citrate, eparchy, hepatic, icetray, itchier, picrate, picrite, pitcher, pithier, preachy, privacy, private, pyritic, ratchet, repatch, repitch, therapy, tipcart, variety, vitiate, yachter, yachtie