The word patronymics 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: 23
Highest Scoring Words With Friends™ Play In The Letters patronymics
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Seven Letter Word Alert: (59 words)
acronym, actions, apricot, apronym, aptonym, armpits, atomics, atonics, campion, cantors, cantrip, caption, captors, cartons, cations, catnips, citrons, company, compart, copyist, crampon, cratons, crayons, crimson, cystoma, cytomas, impacts, imparts, impasto, imports, ironyms, marconi, martins, masonic, masonry, matrons, microns, miscopy, myotics, opacity, paronym, patrons, postman, potamic, primacy, primost, prosaic, rations, scrimpy, somatic, tampons, topiary, toprims, trionym, trisomy, tropics, trypsin, tympani, tyromas