The word teetotalists 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: 13
Highest Scoring Words With Friends™ Play In The Letters teetotalists
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Seven Letter Word Alert: (21 words)
altoist, attelet, attests, easiest, estates, isolate, latites, oleates, osselet, settles, stalest, statist, taoists, tattles, tealess, teasels, teleost, testate, tieless, toeless, toilets