The word congregates 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: 19
Highest Scoring Words With Friends™ Plays In The Letters congregates
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Seven Letter Word Alert: (72 words)
acerose, acetone, argents, atoners, canoers, canters, cantors, careens, cargoes, cartons, catogen, cenotes, centers, centres, cerates, coarsen, coaster, cognate, congest, corneas, cornets, corsage, cratons, creates, earnest, eastern, eggcase, enactor, encores, engages, engorge, enrages, estrone, garnets, gearset, geotags, goatees, grantee, greaten, naggers, nearest, necrose, nectars, negates, negroes, nestegg, octanes, octenes, onstage, oranges, reagent, recanes, recants, recoats, reenact, regents, restage, roseate, scanter, scenter, seagoer, senator, snagger, snogger, stagger, sterane, storage, strange, taggees, taggers, trances, treason