Endonyms are the names natives call their capitals. Exonyms are what people not from that country call other countries. For example: People from Italy call their capital city ROMA (endonym) while people in the U.S. call it ROME (exonym). Guess the ENGLISH exonyms of each capital listed.
Great idea for a quiz! I have a suggestion though. Using Hawaiian for the North America question seems like a stretch. There are other native languages that are much closer geographically and which were in use in prior to Hawaii becoming part of the US. But if you are going to use Hawaiian it might be more appropriate to use the Hawaiian spelling, Wakinekona, as there is no letter "s" or "t" in the Hawaiian alphabet.