I was actually racking my brain for 'starts with a, ends in y, same length' words to make this dumb joke but then I remembered that /usr/share/dict has _huge_ flat-file lists of words of many languages in it, so I could just get them from that?
Ninety seconds of grep, awk and sort later, there it is. For future reference there's 223 of them, alphabetically going from abdominoscopy to axiomatically.
Y'all these computers have so much in them already. _So much_. But nobody knows.