The word nonsovereign 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 nonsovereign
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Seven Letter Word Alert: (33 words)
engines, enviers, environ, erosion, erosive, evening, goosier, governs, greisen, grieves, grooves, ignores, inverse, ionogen, ionones, negroes, nerving, nonenes, noniron, nooning, noosing, orogens, reeving, regions, regives, rennins, serving, snoring, veering, venison, versine, versing, version