The word inseparable 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 inseparable
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Seven Letter Word Alert: (41 words)
aerials, airable, airbase, alpeens, alpines, arabise, arsenal, baleens, banaler, basilar, beanies, biplane, enabler, enables, leaners, leapers, lesbian, nabales, nailers, parable, plainer, planers, pleaser, plebian, praline, presale, realise, rebales, relapse, relines, renails, repanel, repeals, repiles, repines, replane, replans, replies, spaniel, spelean, spiraea