The word treasonably 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 treasonably
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Seven Letter Word Alert: (61 words)
abalone, abaters, abators, abeyant, ablates, ablator, abreast, anaboly, analyse, analyst, analyte, antlers, arblast, areolas, arsenal, arylate, astylar, atoners, baloney, banaler, banters, barleys, baronet, baryons, bayonet, beastly, betrays, blarney, blaster, bloater, boaster, boaters, bolster, bolters, boranes, borates, leantos, loaners, lobster, nabales, noblest, notable, notably, orleans, reblast, reboast, reloans, rentals, reslant, saltern, sayable, sealant, senator, soberly, sorbate, soybean, stabler, sternal, sternly, tenably, treason