The word herbalists 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™ Play In The Letters herbalists
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Seven Letter Word Alert: (55 words)
abseils, airless, albites, artless, ashiest, astilbe, baiters, barites, bashers, basters, bathers, bearish, blaster, blather, blister, blither, braises, braless, breasts, breaths, bristle, halites, halters, hastier, hatless, herbals, herbist, lashers, lathers, libates, rashest, realist, rebaits, rebaths, reblast, relists, resails, retails, ribless, riblets, sailers, saltier, satires, serials, shalier, slasher, slaters, slather, slatier, slither, stabler, stables, trashes, triable, tribals