The word confederated 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: 21
Highest Scoring Words With Friends™ Play In The Letters confederated
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Seven Letter Word Alert: (44 words)
acetone, adorned, cantred, cantref, catered, centred, cordate, crafted, created, decoder, decreed, defaced, defacer, defence, deforce, denoted, detrend, donated, drafted, draftee, enacted, enactor, encoded, encoder, encored, enforce, entered, erected, faceted, fronted, oftener, reacted, recaned, receded, recoded, redated, reenact, refaced, refence, tacnode, tranced, treaded, trended, trodden