The word demosthenic 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 demosthenic
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Seven Letter Word Alert: (52 words)
cements, cenotes, cestode, chemist, chested, codeine, coedits, coesite, deceits, deciohm, dehisce, dements, demonic, demotes, demotic, denoise, denotes, descent, destine, diocese, ditches, emetics, encodes, endemic, endmost, enticed, entices, ethmoid, ethnics, heisted, histone, hoisted, homiest, incomes, methods, mindset, miocene, miscode, misdone, moisten, moschid, notched, notches, noticed, notices, octenes, onetime, scented, schemed, section, techies, thiones