The word aerobatics 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: 16
Highest Scoring Words With Friends™ Play In The Letters aerobatics
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Seven Letter Word Alert: (34 words)
abaters, abators, abreact, abreast, acaters, acrobat, aerobic, airbase, airboat, arabise, ascribe, atresia, baiters, barista, barites, boaster, boaters, borates, cabaret, coaster, cristae, erotica, erotics, iceboat, raciest, rebaits, reboast, recoats, rosacea, scoriae, sorbate, sorbite, strobic, tabasco