The word congregants 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: 20
Highest Scoring Words With Friends™ Plays In The Letters congregants
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Seven Letter Word Alert: (44 words)
argents, atoners, canoers, canters, cantons, cantors, cargoes, cartons, catogen, coarsen, coaster, cognate, congest, consent, corneas, cornets, corsage, cratons, enactor, garnets, geotags, naggers, nascent, nectars, nonarts, octanes, onstage, oranges, recants, recoats, regnant, scanner, scanter, senator, snagger, snogger, stagger, storage, strange, taggers, tanners, tonnage, trances, treason