The word aeronautical 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: 18
Highest Scoring Words With Friends™ Play In The Letters aeronautical
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Seven Letter Word Alert: (70 words)
aconite, aeolian, aileron, alicant, aloetic, arcuate, article, auction, aureola, auricle, autocar, calorie, canulae, canular, carinae, carinal, cauline, caution, centaur, central, certain, clarion, cloture, coalier, coalite, coaltar, corneal, coulter, counter, cranial, curtail, curtain, cutline, elation, elution, enactor, erotica, lactone, lacunae, latrine, lection, lunaria, lunatic, natural, nautica, neutral, nuclear, otarine, outearn, outlier, outline, outrace, rainout, ratline, recital, recount, reliant, retinal, retinol, routine, toenail, trenail, trounce, truncal, unalert, unalter, unclear, uncrate, uralite, urinate