The word demarches 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: 18
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (23 words)
adheres, amerced, amerces, charmed, crashed, creamed, creased, decamer, decares, drachms, headers, hearsed, marched, marches, racemed, racemes, reached, reaches, readmes, schemed, schemer, sheared, smeared