The word preachiest 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 preachiest
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Seven Letter Word Alert: (85 words)
achiest, aeriest, aitches, aseptic, atheise, carpets, cashier, cerates, chapter, chaster, cheaper, cheater, chipset, ciphers, cithers, creates, cristae, eparchs, escaper, etchers, etheric, hapters, haptics, harpies, harpist, hastier, heapers, heaters, hectare, hepatic, heretic, icespar, parches, parties, pastier, patches, peaches, peatier, perches, picrate, pierces, pirates, pitcher, pitches, precast, precise, preheat, raciest, reaches, receipt, recheat, recipes, recites, reheaps, reheats, repaces, repaste, repatch, repeats, repitch, reshape, respace, respect, respice, respite, retapes, retches, reteach, richest, scepter, sceptre, seriate, sharpie, spacier, specter, spectra, spectre, spheric, spicate, teacher, teaches, techies, tephras, traipse, triceps