The word siderophilin 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: 20
Highest Scoring Words With Friends™ Plays In The Letters siderophilin
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Seven Letter Word Alert: (55 words)
dehorns, delphis, despoil, dipoles, dishorn, doilies, dolphin, elision, epsilon, heroins, hinders, holders, idolise, indoles, indorse, inshore, insider, insipid, inspire, iodines, iodiser, ionised, ioniser, iphones, iridise, ironies, lionise, liriope, noisier, periods, phenols, phonier, phonies, pinhold, pinhole, pleions, ponders, presold, proline, respond, rosehip, rosined, shinier, shrined, sirloin, soldier, soliped, spindle, spinier, spinode, spionid, spiroid, splined, spoiled, spoiler