The word mecopteran 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™ Play In The Letters mecopteran
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Seven Letter Word Alert: (27 words)
acetone, compare, compart, compere, compete, crampon, cremate, enactor, octamer, operant, operate, pacemen, percent, precent, precoat, prenote, pronate, protean, reenact, repoman, romance, ropeman, ropemen, tapemen, tempera, tempore, tonearm