The word carcinosarcoma is playable in Words With Friends™, but 1 blank substituting for the letter 'c' is 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: 23
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (25 words)
acacias, cariama, carrion, coronas, corsair, crimson, maniacs, maracas, marasca, marconi, marinas, maroons, mascara, masonic, microns, moronic, narcoma, oarsman, omicron, raccoon, racoons, rancors, sarcoma, sariama, scoriac