The word soundproofer 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 soundproofer
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Seven Letter Word Alert: (42 words)
ferrous, fondues, founder, funders, odorous, onerous, oospore, operons, ponders, poofers, pounder, pourers, prefund, profuse, proofed, proofer, prouder, pruners, refound, refunds, repours, reproof, reroofs, resound, respond, roofers, rounder, snooped, snooper, sounder, spoofed, spoofer, spooned, spoored, spurned, spurner, spurred, sunroof, undoers, unposed, unspoof, uropods