The word costochondritis 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 costochondritis
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Seven Letter Word Alert: (46 words)
chorion, choroid, chronic, citrons, cocoons, cohorts, concord, condors, consist, consort, contort, cordons, cottons, cricoid, crinoid, critics, diction, dishorn, disroot, distort, doctors, hotrods, iconist, incisor, indicts, indoors, intorts, isodont, nordics, notists, oncosis, oncotic, orchids, ostrich, rhotics, risotto, scrooch, sinoids, soricid, stonish, thirsts, tictocs, tocsins, toroids, torsion, tricots