The word transatlantic 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: 19
Highest Scoring Words With Friends™ Play In The Letters transatlantic
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Seven Letter Word Alert: (25 words)
actants, alicant, arctans, artisan, attains, attract, attrist, canasta, cantata, carinal, cattail, cranial, incants, instant, lariats, rattail, saltcat, satanic, stannic, starlit, straint, tantric, tartans, transit, tsarina