The word ferricyanide 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: 22
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (37 words)
acidify, cairned, carried, cyanide, deanery, decayer, decrier, defacer, definer, deifier, denarii, dernier, drainer, edifice, edifier, fancied, fancier, ferried, fiancee, fiercer, fierier, nerdier, rainier, randier, readier, recaned, refaced, refined, refiner, refired, refrain, refried, reified, reifier, yearend, yearned, yearner