The word congregated 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 congregated
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Seven Letter Word Alert: (36 words)
acetone, angered, cantred, catered, catogen, centred, cognate, cordage, cordate, cragged, created, decagon, derange, dogcart, dragnet, enacted, enactor, encoder, encored, engaged, engorge, enraged, goateed, granted, grantee, greaten, grenade, groaned, negated, reacted, reagent, recaned, reenact, tacnode, tangoed, tranced