The word accompanist 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 accompanist
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Seven Letter Word Alert: (28 words)
accompt, actions, anaptic, atomics, atonias, atonics, campion, capstan, captain, caption, cations, catnaps, catnips, coatman, compact, impacts, impasto, maniacs, masonic, patinas, postman, potamic, satanic, scatoma, somatic, stamina, tampons, tapioca