The word proofreaders 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: 19
Highest Scoring Words With Friends™ Play In The Letters proofreaders
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Seven Letter Word Alert: (34 words)
adorers, deposer, drapers, eardrop, fedoras, orderer, poofers, prefade, prefers, proofed, proofer, readers, reapers, rearose, redrape, reorder, reparse, reposed, reposer, reproof, reraped, rerapes, rereads, reroofs, respade, roarers, roofers, seafood, sparred, speared, spearer, spoofed, spoofer, spoored