The word formaldehyde 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: 25
Highest Scoring Words With Friends™ Play In The Letters formaldehyde
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Seven Letter Word Alert: (39 words)
adhered, armhole, deerfly, defamed, defamer, delayed, delayer, demerol, dreamed, earldom, earmold, emerald, eyefold, fadedly, federal, femoral, forayed, foreday, forelay, freedom, healded, healder, hoarded, homered, hydroma, layered, leafery, meadery, meddler, modeled, modeler, redhead, rehomed, relayed, remodel, yealmed, yealmer, yodeled, yodeler