The word grenadiers 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: 14
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (67 words)
angered, angrier, aniseed, dangers, darners, dearies, deniers, deraign, derange, dernier, derries, desirer, drainer, earners, earring, endears, enraged, enrages, erasing, errands, gainers, ganders, gardens, garners, genders, girders, girners, gnarred, graders, grained, grainer, grander, greased, greaser, greisen, grenade, grinder, nerdier, raiders, randier, rangers, rangier, readers, readier, readies, reading, rearing, rearise, redrags, redries, regains, regards, regears, regrade, regrind, reigned, reigner, renders, rereads, rerinse, resider, ringers, sandier, sardine, searing, sedgier, seeding