The word priesthood 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: 16
Highest Scoring Words With Friends™ Play In The Letters priesthood
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Seven Letter Word Alert: (49 words)
dehorts, deports, deposit, diopter, dioptre, disroot, dithers, dopiest, editors, hoisted, hotrods, isotope, optrode, osteoid, peridot, periods, photoed, poorest, posited, pothers, reshoot, roisted, roosted, ropiest, rosehip, shirted, shooter, shorted, soothed, soother, sootier, sortied, spirted, spoored, sported, steroid, stooped, stooper, storied, striped, strophe, tierods, topside, toroids, torpedo, torpids, tripeds, tripods, trooped