The word supervisions 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: 21
Highest Scoring Words With Friends™ Plays In The Letters supervisions
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Seven Letter Word Alert: (40 words)
envious, inspire, insures, ioniser, ionises, ironies, isospin, issuers, ivories, nervous, noisier, osseins, persons, pissier, poseurs, prisons, purines, pussier, pussies, respins, seniors, sensors, serious, session, sinuses, sissier, snipers, soupier, spinier, spinose, spinous, spouses, sunrise, suspire, uprisen, uprises, version, virions, viruses, visions