The word preassembles 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 preassembles
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Seven Letter Word Alert: (51 words)
amblers, amperes, armless, asepses, asperse, beepers, beseems, besmear, blamers, bleeper, blesser, blesses, braless, brasses, earless, elapses, embases, emerses, empress, leapers, leasers, lessees, mapless, marbles, measles, passers, peelers, pleaser, pleases, presale, presses, rambles, rebales, rebases, reblame, rebless, relapse, release, repeals, repeels, resales, reseals, sampler, samples, sapless, sealers, seamers, seeable, serapes, sesames, sleeper