The word demarcates 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: 17
Highest Scoring Words With Friends™ Play In The Letters demarcates
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Seven Letter Word Alert: (39 words)
academe, acaters, acerate, aerated, aerates, amerced, amerces, arcades, cameras, caseate, catered, cerates, creamed, creased, created, creates, cremate, crested, dearest, decamer, decares, demates, racemed, racemes, reacted, readmes, reasted, redacts, redates, remated, remates, reteams, sedater, smarted, smeared, steamed, steamer, tarmacs, tasered