The word trainmaster 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: 15
Highest Scoring Words With Friends™ Plays In The Letters trainmaster
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Seven Letter Word Alert: (73 words)
amentia, amnesia, amritas, animate, antsier, armrest, artiest, artisan, artsier, artsman, artsmen, atresia, attains, attirer, attires, errants, inmates, instate, iratest, mantras, marinas, mariner, marines, marries, martens, martian, martins, matters, metrist, minaret, minters, mittens, narrate, nastier, natters, nattier, nitrate, raiment, ranters, ratters, rattier, remains, remints, restain, restart, retains, retinas, retints, retrain, retrims, satiate, seminar, sirname, smarten, smarter, smartie, smatter, smitten, stainer, stamina, starter, straint, striate, tarries, tartans, tartars, tastier, terrain, tinters, trainer, transit, trimers, tsarina