The word congregating 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: 23
Highest Scoring Words With Friends™ Plays In The Letters congregating
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Seven Letter Word Alert: (52 words)
aconite, ancient, antigen, atoning, cannier, canting, carting, catenin, catogen, certain, coating, cogging, cognate, coinage, contain, coreign, corning, craning, crating, earning, enactor, entrain, erotica, ganging, gearing, gentian, gigaton, gonging, gorging, gracing, granite, grating, ingrate, intoner, ironage, nagging, nearing, orating, organic, otarine, ragging, ranging, ranting, regnant, renting, roaning, taggier, tagging, tangier, tearing, tonnage, tracing