The word taximeters 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 taximeters
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Seven Letter Word Alert: (33 words)
aeriest, artiest, attires, emirate, emitter, extrema, iratest, itemset, iterate, matters, meatier, metrise, metrist, reemits, remates, remixes, restate, retaste, retaxes, reteams, retimes, seamier, seriate, seriema, smartie, smatter, steamer, striate, tastier, teatime, termite, testier, texters