The word sprightliest 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 sprightliest
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Seven Letter Word Alert: (61 words)
elitist, gipsies, girlies, girlish, glister, glitter, gristle, hissier, hitters, lighter, lispers, litters, persist, pettish, philter, philtre, pietist, piglets, pissier, pistils, pithier, pitiers, pitless, plights, priests, relight, relists, reships, resight, resplit, retilts, sighers, sighter, siltier, sitters, sleighs, sleight, slights, slither, slitter, spirits, spittle, spriest, spright, sprites, stilter, stipite, stripes, theists, thirsts, thistle, tighter, tigress, tigrish, tilters, tipless, tipsier, tipster, tithers, triples, triplet