I played the scene over a dozen times last night, which trumps your three viewings, and I'm still convinced that he doesn't say "aft nacelle". Certainly not in the pre-JJverse Star Trek Lexicon. However within the JJverse itself, that may no longer be the case. Also... in response to an earlier post: That's the way the syllables of the word actually fall. Nothing laughable about it. Nor is it at all unthinkable that Khan would draw attention to every syllable, to drive home the point that he knew precisely where to hit them.