The word stoolpigeon 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 stoolpigeon
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Seven Letter Word Alert: (42 words)
elogist, eloigns, eloping, epilogs, epsilon, glisten, gooiest, isotope, legions, leptons, lingoes, lionets, longest, loonies, looping, loosing, looting, lotions, oleosin, oolites, oolongs, options, pelting, pigeons, piglets, pingles, pingoes, pleions, plosion, pooling, posting, potions, singlet, sloping, soloing, sooting, stoolie, tingles, tooling, toonies, topline, topsoil