The word rhodochrosite 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: 21
Highest Scoring Words With Friends™ Play In The Letters rhodochrosite
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Seven Letter Word Alert: (64 words)
ceroids, cherish, chooser, choroid, cithers, coedits, coheirs, cohorts, cooties, corrode, credits, crosier, dehorts, directs, disroot, ditcher, ditches, dithers, doctors, editors, erotics, heroics, hitched, hitcher, hitches, hoisted, horsier, hotrods, orchids, osteoid, ostrich, records, rectors, redroot, reroots, reshoot, rhetors, rhotics, richest, rioters, roisted, roister, roosted, rooster, rooters, scooted, scooter, shirted, shooter, shorted, shorter, soothed, soother, sootier, sortied, steroid, stirred, storied, strider, stridor, tierods, torched, torches, toroids