The word crestfallen 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: 20
Highest Scoring Words With Friends™ Play In The Letters crestfallen
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Seven Letter Word Alert: (69 words)
antlers, callers, canters, cantles, cantref, careens, cartels, cellars, centers, central, centres, cerates, cereals, clarets, cleaner, cleanse, creates, earnest, eastern, elaters, enteral, eternal, fallers, falters, fellers, fellest, fencers, flenser, lancers, lancets, lateens, leaflet, leaners, leanest, lectern, nearest, nectars, realest, recalls, recanes, recants, reclean, reenact, refaces, refects, reflate, reflect, relaces, relates, relents, rentals, rescale, reslant, retells, saltern, scalene, scanter, scarlet, scenter, sclerae, scleral, selfact, stealer, stellar, sterane, sternal, tellers, trances, treacle