The word ptarmigans 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: 19
Highest Scoring Words With Friends™ Play In The Letters ptarmigans
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Seven Letter Word Alert: (35 words)
against, airgaps, amritas, armpits, artisan, artsman, gastrin, imparts, mantrap, mantras, margins, marinas, martian, martins, matings, migrant, parings, parsing, parting, pasting, patinas, prating, rampant, rasping, ratings, sangria, sparing, spartan, stamina, staring, tamping, tangram, tapings, tarpans, tsarina