The word dodecahedron 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: 21
Highest Scoring Words With Friends™ Play In The Letters dodecahedron
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Seven Letter Word Alert: (25 words)
adhered, adorned, cheddar, cohered, crooned, deadend, decoded, decoder, deodand, dreaded, encoded, encoder, encored, hoarded, honored, honoree, ranched, reached, readded, recaned, recoded, redhead, rehoned, roached, rodeoed