The word archpriest 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: 18
Highest Scoring Words With Friends™ Play In The Letters archpriest
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Seven Letter Word Alert: (71 words)
achiest, aitches, archers, artsier, aseptic, aspirer, carpers, carpets, carries, carters, cashier, chapter, charier, charter, chaster, chipset, chirper, ciphers, cithers, crasher, craters, crisper, cristae, eparchs, erratic, hapters, haptics, harpers, harpies, harpist, hastier, hepatic, icespar, parches, parties, pastier, patches, phraser, picrate, pirates, pitcher, pitches, praiser, praters, precast, pricers, raciest, raspier, rechart, repairs, repatch, repitch, restrap, retraps, richest, scarier, scraper, sharper, sharpie, spacier, spectra, spheric, spicate, striper, tarries, tephras, tracers, traipse, trasher, triarch, triceps