The word expansionist 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: 24
Highest Scoring Words With Friends™ Plays In The Letters expansionist
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Seven Letter Word Alert: (46 words)
anoints, aptness, asinine, axinite, axstone, exposit, inosine, inosite, insteps, intones, ionises, isospin, nations, noseans, nosiest, opiates, pansies, panties, passion, pasties, patines, pension, pianist, pinions, pinnate, pistons, pontine, poxiest, saponin, seitans, sestina, sexpots, sextain, sextons, siennas, sixstep, sixties, sonnets, spinets, spinnet, spinons, spinose, stepson, tenpins, tension, tiepins