The word bolstering 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 bolstering
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Seven Letter Word Alert: (63 words)
belongs, belting, besting, betoils, bingers, blister, boilers, bolster, bolters, bolting, boniest, borings, bristle, bristol, elogist, eloigns, estriol, gerbils, giblets, girnels, glisten, glister, glories, goblets, goblins, goiters, goitres, goriest, gristle, ignoble, ignores, legions, lingers, lingoes, lionets, lobster, loiters, longest, noblest, norites, nostril, obliger, obliges, orients, reblogs, reboils, regions, resting, retinol, riblets, ringlet, singlet, slinger, sorbite, sorting, stinger, stonier, storing, tingler, tingles, toilers, trilobe, triones