The word stumpknocker is playable in Words With Friends™, but 1 blank substituting for the letter 'k' is 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: 26
Highest Scoring Words With Friends™ Play In The Letters stumpknocker
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Seven Letter Word Alert: (55 words)
compute, conkers, consume, cornets, costume, counter, crumpet, encrust, knocker, mentors, meronts, mockers, mockups, monster, mounter, muckers, muscone, nostrum, pockets, postern, postmen, posture, pouncer, pounces, pouters, precuts, pronest, puckers, punster, punters, reckons, recount, recoups, rectums, reknots, remount, restock, restuck, restump, rockets, scouter, scrotum, spouter, sternum, stocker, stomper, stumper, tonsure, trounce, troupes, tuckers, uncorks, unkempt, unspoke, unstock