The word taxidrivers 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: 23
Highest Scoring Words With Friends™ Play In The Letters taxidrivers
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Seven Letter Word Alert: (42 words)
adverts, adviser, airiest, airside, aridest, arrived, arrives, artsier, astride, avidest, dairies, darters, diaries, diarist, dirtier, dirties, disrate, ditsier, diverts, drivers, editrix, irisate, radixes, raiders, retards, revisit, starred, starved, starver, stirred, stivier, strider, strived, striver, tardier, tarried, tarries, tidiers, tirades, traders, veritas, visited