The word herbalist 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: 15
Highest Scoring Words With Friends™ Play In The Letters herbalist
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Seven Letter Word Alert: (33 words)
albites, astilbe, baiters, barites, bathers, bearish, blaster, blather, blister, blither, breaths, bristle, halites, halters, hastier, herbals, herbist, lathers, libates, realist, rebaits, rebaths, reblast, retails, riblets, saltier, shalier, slather, slatier, slither, stabler, triable, tribals