The word bristletails 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: 17
Highest Scoring Words With Friends™ Plays In The Letters bristletails
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Seven Letter Word Alert: (96 words)
abseils, airiest, airless, albites, alibies, artiest, artists, artless, astilbe, attires, baiters, ballets, barites, basters, batlets, batters, battier, battler, battles, billets, bitrate, bitsets, bitsier, bitters, bittier, blaster, blister, braille, braises, braless, breasts, bristle, brittle, elitist, illites, iratest, irisate, latites, liaises, libates, liberal, literal, litters, littler, rallies, ratbite, rattles, realist, rebaits, rebills, reblast, relists, resails, retails, retills, retilts, ribless, riblets, rillets, risible, sailers, saltier, satires, serials, sillier, siltier, sitters, slaters, slatier, slitter, stabler, stables, stalest, starlet, starlit, startle, staters, stellar, stiller, stilter, straits, striate, tablets, tallest, tallier, tallies, tasters, tastier, terabit, tertial, tillers, tilters, trellis, triable, tribals, tsarist