The word siderocyte 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: 16
Highest Scoring Words With Friends™ Play In The Letters siderocyte
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Seven Letter Word Alert: (30 words)
ceroids, cestode, coedits, coesite, coterie, credits, crested, cystoid, deceits, decoyer, decries, deicers, destroy, diester, dieters, diocese, directs, editors, erotics, erotise, recited, recites, recodes, reedits, roisted, society, sortied, steroid, storied, tierods