The word dignitaries 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™ Play In The Letters
Seven Letter Word Alert: (84 words)
aigrets, airiest, airings, airside, antsier, argents, aridest, arising, astride, dairies, dangers, darting, denarii, deraign, destain, detains, detrain, diaries, diarist, dieting, dingier, dingies, dirties, disrate, ditsier, dragnet, editing, erasing, gainers, gaiters, ganders, gardens, garnets, gastrin, grained, granite, granted, ignited, igniter, ignites, inditer, indites, inertia, ingrate, insider, instead, iridise, irisate, nastier, nitride, raiding, raising, ratings, reading, regains, restain, resting, retains, retinas, ridings, sainted, sandier, sardine, searing, seating, stagier, stained, stainer, stander, staring, stinger, strange, tangier, tearing, teasing, tidiers, tidings, tiering, tinders, tirades, tradein, trading, trained, triages