CARAPAR Vs. KARAPAR Mark: Once upon a time, there was a BARRAKI with two names: CARAPAR and KARAPAR. CARAPAR seems to be the "official" name of set 8918 because that is what is printed on the canisters and in the advertisements. But CARAPAR was at one time in the past (or perhaps sometime in the past's future was supposed to be changed to): KARAPAR. You can see that alternative spelling both on set 8918's front page of instructions (above) and on BIONICLE.com's introduction to the BARRAKI.
KARAPAR certainly seems to be the more BIONICLE-esque spelling. I am curious to see which spelling will appear in the upcoming Scholastic books.