The word servitudes 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: 16
Highest Scoring Words With Friends™ Play In The Letters servitudes
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Seven Letter Word Alert: (40 words)
derives, deserts, desires, dessert, devests, deviser, devises, diester, dieters, diverse, diverts, divests, dusters, dustier, erudite, reedits, reissue, resides, residue, restive, revised, revises, revuist, riveted, rudites, sievert, stivers, strides, strived, strives, studier, studies, sudsier, suiters, tissued, tressed, trussed, verists, virtues, viruses