The word dumbwaiters 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™ Plays In The Letters dumbwaiters
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Seven Letter Word Alert: (69 words)
abiders, admires, airbeds, ambries, aridest, astride, atriums, baiters, barites, bariums, bawdier, bedirts, bestrid, beswarm, betrims, braised, bruised, brumate, brutism, bursate, bustard, bustier, daubers, disrate, disturb, dumbest, dustier, erbiums, imburse, matured, matures, midwest, misdate, misdraw, misdrew, misread, muriate, mustard, mustier, radiums, readmit, reaudit, rebaits, rudites, rumbaed, seabird, sidearm, sidebar, smarted, smartie, stadium, steward, strawed, studier, subedit, subitem, submaid, swarmed, tediums, terbium, timbers, timbres, tirades, tridems, waisted, waiters, wariest, warmest, wartime