The word superscribes 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: 22
Highest Scoring Words With Friends™ Plays In The Letters superscribes
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Seven Letter Word Alert: (50 words)
berries, bruiser, bruises, cerises, cresses, crisper, cruiser, cruises, curries, cursers, cussers, epicure, issuers, percuss, peruses, piercer, pierces, precise, presser, presses, pricers, prussic, pursers, pussier, pussies, recipes, recures, recurse, recuses, reissue, repress, reprice, reprise, rescrub, rescuer, rescues, respice, respire, rubrics, scriber, scribes, securer, secures, species, spicers, sprucer, spruces, suspire, upriser, uprises