The word superstitious 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: 18
Highest Scoring Words With Friends™ Plays In The Letters superstitious
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Seven Letter Word Alert: (79 words)
estrous, issuers, oestrus, ousters, outputs, outsets, outsits, outstep, persist, pietist, pissier, piteous, pitiers, poseurs, possets, posters, posture, potters, potties, pouters, poutier, priests, protest, protist, purists, pursues, pursuit, pussier, pussies, putters, puttier, putties, reposts, resists, respots, ropiest, rosiest, russets, serious, sissier, sisters, sitters, sorties, soupier, sourest, spirits, spotter, spouses, spouter, spriest, sprites, sprouts, sputter, stipite, stories, stourie, stouter, stripes, stupers, stupors, suiters, suitors, suspire, sutures, tipsier, tipster, tiptoer, tiptoes, tissues, toruses, tossers, tossups, tourist, touters, tropist, troupes, trusses, uprises, uprouse