The word decathlons 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 decathlons
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Seven Letter Word Alert: (44 words)
acnodes, alecost, candles, cantles, castled, cathode, chalets, chanted, chasten, cholate, clashed, clothed, clothes, coasted, coldest, daltons, deacons, decants, dentals, descant, donates, ethanol, handles, handset, headons, lactone, lactose, lancets, latched, latches, leantos, loathed, loathes, located, locates, notched, notches, octanes, satchel, scathed, shoaled, slanted, solaced, tacnode