The word accustoming 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™ Play In The Letters accustoming
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Seven Letter Word Alert: (40 words)
account, actions, agnosic, agonism, agonist, agoutis, amongst, amounts, amusing, atomics, atonics, auction, casting, cations, causing, caustic, caution, coating, cognacs, comings, costing, gnomist, gnostic, masonic, matings, moating, mousing, mustang, ousting, outgain, outings, outmans, outsang, sanctum, saucing, somatic, suction, toucans, tsunami, unstoic