The word bristletail 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: 16
Highest Scoring Words With Friends™ Plays In The Letters bristletail
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Seven Letter Word Alert: (72 words)
airiest, albites, alibies, artiest, astilbe, attires, baiters, ballets, barites, batlets, batters, battier, battler, battles, billets, bitrate, bitsier, bitters, bittier, blaster, blister, braille, bristle, brittle, elitist, illites, iratest, irisate, latites, libates, liberal, literal, litters, littler, rallies, ratbite, rattles, realist, rebaits, rebills, reblast, retails, retills, retilts, riblets, rillets, risible, saltier, sillier, siltier, slatier, slitter, stabler, starlet, starlit, startle, stellar, stiller, stilter, striate, tablets, tallest, tallier, tallies, tastier, terabit, tertial, tillers, tilters, trellis, triable, tribals