The word trendsetting 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: 17
Highest Scoring Words With Friends™ Plays In The Letters trendsetting
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Seven Letter Word Alert: (62 words)
deniers, dentine, denting, dentins, dentist, destine, detents, diester, dieters, dinners, edgiest, endings, engined, engines, entries, genders, greisen, grinned, gritted, indents, integer, intends, intense, intents, interns, needing, nesting, netters, netting, nitrene, reedits, regents, reigned, rending, rennets, renting, resting, retints, sedgier, seeding, sending, setting, stented, sterned, stinger, stinted, tenders, tending, tenners, tensing, tenters, tentier, tenting, testier, testing, tinders, tinners, tinters, titters, treeing, trident, trienes