The word elasmobranch 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: 25
Highest Scoring Words With Friends™ Play In The Letters elasmobranch
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Seven Letter Word Alert: (84 words)
abalone, almoner, amblers, ambsace, amoebas, anarchs, anchors, anomers, archeal, archean, archons, areolas, armhole, arsenal, balance, banaler, baseman, beacons, bemoans, blamers, boranes, cablers, caeomas, cambers, cameras, canoers, caramel, carbons, chamber, cholera, chorale, chorals, chroman, chromel, chromes, clamber, clamors, clasher, cloners, coalers, coalman, coalmen, coarsen, combers, corneal, corneas, crabman, enamors, encalms, escolar, herbals, hombres, lancers, larches, loaners, macabre, manacle, manhole, marbles, marches, marshal, menorah, moaners, monarch, morales, nabales, narcoma, normals, oarsman, oarsmen, oracles, orleans, rambles, ranches, recoals, recombs, reloans, roaches, romance, rosacea, sarcoma, scholar, shamble, solacer