The word doorstoppers 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™ Plays In The Letters doorstoppers
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Seven Letter Word Alert: (42 words)
deports, despots, dropper, oospore, opposed, opposer, opposes, oppress, optrode, poopers, poorest, poroses, porters, posters, presort, propose, prosper, redroot, reports, reposts, reroots, resorps, resorts, respots, roosted, rooster, rooters, rosters, soppers, sorters, spoored, sported, stooped, stooper, stopped, stopper, toppers, toprope, torpedo, torpors, trooped, trooper