The word alphanumeric 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: 26
Highest Scoring Words With Friends™ Play In The Letters alphanumeric
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Seven Letter Word Alert: (91 words)
achiral, alumina, alumnae, anaemic, arcanum, archeal, archean, arenium, auricle, caliper, campier, canulae, canular, caramel, carinae, carinal, carmine, cauline, chainer, chapman, chimera, claimer, clamper, cleanup, clumper, cranial, cranium, crimple, crumple, haircap, harelip, heparin, hernial, humaner, humeral, impaler, impanel, impeach, inhaler, inplace, inreach, lacunae, laminae, laminar, lempira, lumpier, lunaria, luncher, machine, macular, mailcar, manacle, manlier, mineral, miracle, nuclear, numeral, numeric, paceman, paenula, palmier, panicle, pelican, pemican, phrenic, pincher, piranha, plainer, plumier, praline, primula, pumicer, puncher, rechain, reclaim, reclamp, replica, rhenium, rheumic, ruminal, unchair, uncharm, unclamp, unclear, uncramp, uncrime, unparch, unperch, upreach, uraemia, uraemic