The word ambidexterity 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: 29
Highest Scoring Words With Friends™ Play In The Letters ambidexterity
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Seven Letter Word Alert: (53 words)
abetted, abetter, airtime, ambered, aridity, attired, axebird, battery, battier, beadier, bedirty, bedmate, bedtime, beermat, bemired, berated, betimed, bitrate, bittier, daytime, debater, demerit, dietary, dimeter, editrix, embread, emirate, emitted, emitter, exabyte, extrema, imitate, iterate, maybird, meadery, meatier, mediate, merited, midyear, mitered, ratbite, readmit, rebated, rebited, remated, remixed, retaxed, retimed, teatime, terabit, termite, timider, treated