The word bristlegrass 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 bristlegrass
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Seven Letter Word Alert: (91 words)
abseils, aiglets, aigrets, airless, albites, arbiter, arrests, artless, artsier, asserts, astilbe, bagless, baiters, bargirl, barites, barrels, barters, bassets, bassist, basters, biasses, blaster, blisses, blister, braiser, braises, braless, brasier, brasses, breasts, bristle, gaiters, garbler, garbles, garrets, garters, gasless, gassers, gassier, gerbils, giblets, glasses, glister, grasses, graters, grister, gristle, largess, largest, lassies, libates, ligases, ligates, raisers, rarebit, rasters, realist, rebaits, reblast, regrabs, relists, resails, resists, restirs, retails, retrial, ribless, riblets, sagiest, sailers, saltier, sassier, satires, serials, sierras, siestas, sisters, slaters, slatier, stabler, stables, stagers, stagier, starers, tarries, tassels, tigress, trailer, triable, triages, tribals