WotC's YA Practical Guides series has actual magical words for a bunch of spells in [ame=http://www.amazon.com/Practical-Guide-Wizardry-Guides-fantasy/dp/0786950420/ref=sr_1_1?ie=UTF8&s=books&qid=1300225529&sr=8-1]A Practical Guide to Wizardry[/ame]. I find the books are actually pretty good flavor and are nicely systemless.
Kalakoa, roughly translated its Aztec for Enter through the door
[sblock=Full Translation] Kalakoa = entrar por la puerta, entrar por la puerta = Enter through the door. So ala A=B, B=C so A=C Kalakoa = Enter through the door[/sblock]
If your looking for Mezzoamerican twists to words, AULEX - Diccionario Náhuatl - Español en línea is a good suggestion, working knowledge of Spanish, Google Chrome or a translator for English <-> Spanish required for it to be of any use however.