The word separatists 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: 14
Highest Scoring Words With Friends™ Plays In The Letters separatists
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Seven Letter Word Alert: (53 words)
apatite, apteria, artiest, artists, asepsis, aspires, assarts, asserts, atresia, attires, iratest, paresis, parties, passers, pasters, pastier, pasties, patters, patties, persist, pirates, praises, priests, rapists, repasts, resists, sarapes, sassier, satiate, satires, satraps, searats, seastar, siestas, sisters, sitters, sparest, spatter, spiraea, spireas, spriest, sprites, staters, straits, stratas, striate, stripes, tapster, tasters, tastier, tipster, traipse, tsarist