The word stewardess 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: 14
Highest Scoring Words With Friends™ Play In The Letters stewardess
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Seven Letter Word Alert: (28 words)
asserts, dearest, deserts, dessert, dewater, dresses, reasted, redates, resawed, reseats, seaters, sedater, sedates, seesaws, steward, strawed, strewed, sweated, sweater, tarweed, tasered, teasers, tressed, tresses, wasters, watered, wrasses, wrested