The word overreacted 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™ Play In The Letters overreacted
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Seven Letter Word Alert: (35 words)
averred, averted, averter, catered, caterer, cordate, covered, coverer, coveted, coveter, created, creator, decreer, devotee, erected, erecter, erector, everted, evocate, overact, overate, overeat, reacted, reactor, recover, recrate, reerect, retrace, retrade, retread, retreed, revered, revoted, terrace, treader