The word soundproofed 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: 22
Highest Scoring Words With Friends™ Play In The Letters soundproofed
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Seven Letter Word Alert: (46 words)
defunds, desnood, despond, drooped, duopods, endopod, fodders, fondues, founded, founder, funders, nodders, odorous, onerous, oospore, operons, ponders, poofers, pounded, pounder, prefund, profuse, proofed, redound, refound, refunds, resound, respond, rounded, snooded, snooped, snooper, sounded, sounder, spoofed, spoofer, spooned, spoored, spurned, sunroof, undoers, undoped, undosed, unposed, unspoof, uropods