The word decasyllabic 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: 26
Highest Scoring Words With Friends™ Play In The Letters decasyllabic
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Seven Letter Word Alert: (25 words)
acylase, aliased, allayed, ballads, basally, bicycle, calicle, calyces, cascade, cecally, cedilla, cicadas, cyclase, cyclise, diabase, dialyse, dicycle, disable, disally, iceball, ideally, labials, salable, salably, sayable