The word prescriptive 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: 25
Highest Scoring Words With Friends™ Plays In The Letters prescriptive
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Seven Letter Word Alert: (48 words)
crisper, peptise, percept, pervert, picrite, piercer, pierces, pieties, pitiers, precept, precise, pricers, pricier, receipt, recipes, reciter, recites, repipes, reprice, reprise, respect, respice, respire, respite, restive, retires, retries, reverts, reviser, revisit, rippers, riveter, scepter, sceptre, service, sievert, specter, spectre, spicier, stepper, stivier, striper, striver, tippers, tippier, tipsier, triceps, tripper