The word foreknowledge 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: 28
Highest Scoring Words With Friends™ Plays In The Letters foreknowledge
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Seven Letter Word Alert: (26 words)
flooder, floored, fondler, foreleg, forgone, frowned, gleeked, gleeker, greened, growled, kerogen, kneeled, kneeler, legwork, lowered, needler, onefold, oreweed, reendow, reflood, reflown, relodge, reneged, renewed, weekend, wronged