The word ferrocyanide 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: (45 words)
adorner, aneroid, cairned, carried, carrion, codeine, confide, conifer, cornier, cyanide, cyanoid, deanery, decayer, decoyer, decrier, defacer, definer, deforce, dernier, drainer, encoder, encored, enforce, fancied, fancier, ferried, fiancee, fiercer, forayed, forayer, foreday, nerdier, randier, readier, readorn, recaned, refaced, refined, refiner, refired, refrain, refried, yearend, yearned, yearner