The word superstructure 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 superstructure
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Seven Letter Word Alert: (54 words)
cresset, curette, cursers, cutters, percuss, peruses, pesters, precuts, presets, presser, pretest, pursers, pursuer, pursues, putters, recures, recurse, recuses, repress, rescuer, rescues, resects, respect, resteps, resters, retests, reutter, rupture, scepter, sceptre, secrets, securer, secures, septets, setters, specter, spectre, sprucer, spruces, spurrer, spurter, sputter, streets, stupers, suspect, sutures, tersest, testers, trustee, truster, turrets, ureters, usurper, utterer