The word aeronautic 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: 15
Highest Scoring Words With Friends™ Play In The Letters aeronautic
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Seven Letter Word Alert: (22 words)
aconite, arcuate, auction, autocar, carinae, caution, centaur, certain, counter, curtain, enactor, erotica, nautica, otarine, outearn, outrace, rainout, recount, routine, trounce, uncrate, urinate