The word cyanocobalamin 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: 31
Highest Scoring Words With Friends™ Play In The Letters cyanocobalamin
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Seven Letter Word Alert: (34 words)
acclaim, acyloin, alimony, almanac, amiably, anaboly, animacy, anomaly, balcony, bonnily, caconym, cambial, cannily, cannoli, cannolo, canonic, coalbin, coalman, cocoyam, colonic, comical, conical, cynical, laconic, malacia, mycolic, nomancy, nominal, nonclay, noncola, nonmail, nonoily, obconic, oomancy