The word supervening 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: 23
Highest Scoring Words With Friends™ Play In The Letters supervening
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Seven Letter Word Alert: (39 words)
engines, ensuing, enviers, evening, genuine, greisen, grieves, gunners, inverse, nerving, nursing, peering, peeving, penguin, penners, pennies, pensive, pinenes, pingers, prevues, pruning, punners, punnier, purines, pursing, reeving, regives, repines, reusing, seeping, serving, spinner, sunnier, unnerve, unrisen, uprisen, veering, versine, versing