The word metatarsals 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: 15
Highest Scoring Words With Friends™ Plays In The Letters metatarsals
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Seven Letter Word Alert: (24 words)
armless, armlets, artless, atlases, masters, matters, rattles, salaams, saltate, samaras, searats, seastar, slaters, smatter, stalest, starlet, startle, staters, stratas, streams, tamales, tarsals, tasters, tramels