The word fosterling 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™ Play In The Letters fosterling
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Seven Letter Word Alert: (58 words)
elogist, eloigns, estriol, felting, filters, fingers, florets, florins, florist, foister, foreign, forgets, forints, forties, fringes, froglet, girnels, glisten, glister, glories, goiters, goitres, golfers, goriest, gristle, ignores, legions, lifters, lingers, lingoes, lionets, loftier, lofting, loiters, longest, norites, nostril, olefins, orients, reflogs, regions, resting, retinol, ringlet, singlet, slinger, snifter, sorting, stifler, stinger, stonier, storing, tingler, tingles, toilers, trefoil, trifles, triones