The word metacarpals 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: 21
Highest Scoring Words With Friends™ Plays In The Letters metacarpals
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Seven Letter Word Alert: (48 words)
acaters, alpacas, amplest, aptamer, armlets, calmest, caltrap, cameras, campers, caplets, caramel, carpals, carpels, carpets, cartels, clamper, clarets, clasper, lactase, maracas, marasca, mascara, palaces, palates, palmate, palters, parcels, patacas, placate, placers, plaster, platers, precast, reclamp, reclasp, restamp, sampler, scalper, scamper, scarlet, spectra, stamper, stapler, tamales, tampers, tarmacs, tramels, trample