The word cordierites 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: 15
Highest Scoring Words With Friends™ Play In The Letters cordierites
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Seven Letter Word Alert: (62 words)
ceroids, cestode, coedits, coesite, coterie, credits, crested, crosier, deceits, decrier, decries, deicers, deistic, deities, derries, desirer, diciest, diester, dieters, dietics, dieties, diocese, diorite, directs, dirtier, dirties, ditsier, editors, eidetic, erector, erotics, erotise, iodiser, iodites, recited, reciter, recites, recodes, records, rectors, redries, reedits, rescore, resider, restore, retired, retires, retried, retries, rioters, roisted, roister, soricid, sortied, steroid, stirred, storied, strider, stridor, tidiers, tierods, tireder