The word understudying 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: 23
Highest Scoring Words With Friends™ Plays In The Letters understudying
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Seven Letter Word Alert: (80 words)
density, denting, dentins, denying, destiny, dinners, distend, drudges, dunites, dustier, dusting, dyeings, dyneins, eddying, endings, ensuing, grinded, grinned, grunted, gunners, gunnery, gunters, gurneys, gustier, gutsier, indents, insured, intends, interns, intrude, inturns, nesting, nursing, nutsier, rending, renting, resting, restudy, retying, reusing, ruddies, rudites, rusting, sending, snudged, stinger, stringy, studied, studier, stunned, stunner, sunnier, sutured, synurid, syringe, tending, tensing, tinders, tindery, tinners, triynes, trudged, trudgen, trudges, tunings, turndun, turning, undents, undined, undines, undrest, undried, undying, unguent, uniters, unrisen, untired, untried, untuned, untying