The word disgruntled 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: 18
Highest Scoring Words With Friends™ Play In The Letters disgruntled
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Seven Letter Word Alert: (81 words)
delints, dentils, diluent, diluted, diluter, dilutes, distend, drudges, dueling, duelist, dunites, dustier, dusting, eluding, eluting, gilders, girdled, girdles, girnels, gliders, glinted, glisten, glister, gluiest, glutens, griddle, grinded, gristle, grunted, gruntle, guilder, guilted, guldens, gunters, gustier, gutsier, indulge, insured, intrude, lingers, luddite, luniest, lustier, lusting, nutsier, regilds, resting, reusing, riddles, ringlet, ruddies, rudites, rulings, rusting, rustled, rutiles, singled, singlet, slinger, snudged, stinger, strudel, studied, studier, tendril, tinders, tingled, tingler, tingles, trudged, trudgen, trudges, trundle, ugliest, undrest, undried, uniters, untiled, untired, untried, utensil