The word tachymeters 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 tachymeters
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Seven Letter Word Alert: (52 words)
amerces, cattery, cerates, chaster, chatter, cheater, chymase, creates, cremate, ecthyma, etchers, hamster, hatters, heaters, hectare, machete, marches, mastery, matcher, matches, matters, racemes, ratchet, reaches, recheat, reheats, rematch, remates, restate, retaste, retches, reteach, reteams, scatter, schemer, screamy, scyther, shatter, smatter, starchy, steamer, streamy, stretch, teacher, teaches, testacy, tethers, theater, theatre, thereat, threats, yachter