The word metacarpus 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: 20
Highest Scoring Words With Friends™ Play In The Letters metacarpus
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Seven Letter Word Alert: (31 words)
acaters, acuates, amateur, aptamer, arcuate, aurates, cameras, campers, capture, carpets, cauters, crumpet, curates, cuspate, matures, pasture, precast, precuts, rectums, restamp, restump, scamper, spectra, stamper, stumper, tampers, tarmacs, teacups, tempura, traumas, uprates