The word inseparably 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: 21
Highest Scoring Words With Friends™ Play In The Letters inseparably
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Seven Letter Word Alert: (43 words)
ablepsy, aerials, airable, airbase, airplay, alpines, analyse, arabise, arsenal, bairnly, banaler, barleys, basilar, bilayer, biplane, blarney, byliner, bylines, inlayer, lesbian, nabales, nailers, paisley, parable, parlays, parleys, parsley, payable, plainer, planers, players, plebian, plenary, praline, renails, repayal, replans, replays, sayable, spaniel, sparely, spiraea, splayer