The word sovereignty 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: 20
Highest Scoring Words With Friends™ Play In The Letters sovereignty
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Seven Letter Word Alert: (57 words)
entries, enviers, erosive, erotise, estrone, goiters, goitres, goriest, governs, greisen, greyest, grieves, grovets, ignores, integer, inverse, inverts, negroes, norites, orients, overset, oversit, reeving, regents, regions, regives, resting, restive, retying, revotes, serving, seventy, sievert, sorting, stinger, stonier, storing, stringy, striven, styrene, syenite, syringe, treeing, trienes, triones, triynes, veering, versine, versing, version, vertigo, vestige, vesting, vetoers, vetoing, voteens, yestern