The word arthromeres 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: 16
Highest Scoring Words With Friends™ Play In The Letters arthromeres
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Seven Letter Word Alert: (48 words)
armorer, armrest, earshot, emoters, hamster, hearers, heaters, heteros, hoarser, maestro, marrers, meteors, mortars, mothers, reamers, rearose, reharms, rehears, reheats, rehomes, remates, remorse, remoter, remotes, reroast, reshare, reshore, restore, reteams, retears, rhetors, roamers, roarers, roaster, roseate, serrate, shearer, shorter, smarter, smearer, smother, steamer, tearers, terrors, theorem, thermos, trasher, tremors