The word socialisers 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: 15
Highest Scoring Words With Friends™ Plays In The Letters socialisers
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Seven Letter Word Alert: (46 words)
airless, calorie, carless, celosia, classes, closers, coalers, coalier, coalise, cresols, crosses, eclairs, escolar, laicise, lassies, lassoer, lassoes, lessors, liaises, lossier, oarless, oracles, ossicle, reclass, recoals, recoils, resails, resoils, rosalic, sacless, sailers, sailors, sassier, scalers, scalier, scissor, scleras, scoriae, scorias, serials, silicas, sissier, slicers, socials, solacer, solaces