The word geartrains 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: 13
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (64 words)
against, agatine, agatise, aigrets, angrier, antsier, argents, arraign, arrange, artisan, artsier, atresia, earring, eartags, erasing, errants, gainers, gaiters, garners, garnets, garrets, garters, gastrin, girners, grainer, granite, granter, graters, grister, ingrate, narrate, nastier, rangers, rangier, ranters, ratings, rearing, regains, regrant, restain, resting, retains, retinas, retrain, ringers, sangria, searing, seating, stagier, stainer, staring, stinger, strange, tanager, tangier, tarries, tarring, teargas, tearing, teasing, terrain, trainer, triages, tsarina