The word machmeters 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 machmeters
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Seven Letter Word Alert: (32 words)
amerces, ammeter, cerates, chaster, cheater, creates, cremate, etchers, hammers, hamster, heaters, hectare, machete, marches, matcher, matches, metamer, racemes, reaches, recheat, reheats, rematch, remates, retches, reteach, reteams, schemer, shammer, stammer, steamer, teacher, teaches