The word archdeacons 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 archdeacons
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Seven Letter Word Alert: (42 words)
accords, acnodes, adhorns, anarchs, anchors, arcades, archean, archons, cachers, canards, cancers, candors, canoers, cascade, chanced, chances, chancre, charade, coached, coaches, coarsen, conches, corands, corneas, crashed, dancers, deacons, dehorns, dharnas, hadrons, handcar, handers, hardens, headons, ranched, ranches, roached, roaches, rosacea, sarcode, sconced, scorned