The word presciences 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: 21
Highest Scoring Words With Friends™ Play In The Letters presciences
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Seven Letter Word Alert: (23 words)
censers, cerises, crispen, eccrine, epicene, essence, penises, pierces, pincers, precise, princes, recipes, repines, respice, respins, science, screens, secerns, seepier, sincere, snipers, species, spicers