The word uniformises 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™ Plays In The Letters uniformises
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Seven Letter Word Alert: (34 words)
fermion, firmoss, fission, fissure, fusions, fussier, informs, infuser, infuses, infusor, insures, ioniser, ionises, ironies, isomers, meiosis, minuses, misfire, mission, misuser, mossier, mousers, mousier, noisier, seniors, serious, sermons, sunrise, surmise, unforms, unifier, unifies, uniform, urnmoss