IPA: //ˌsɜːrkəmˈnævɪɡeɪtər//
KK: /sɜrkəmˈnævɪˌɡeɪtər/
A person who travels all the way around the world, usually by ship or other means of transportation.
Famous circumnavigators like Ferdinand Magellan have made history by sailing around the globe.
Circumnavigator is formed from "circum-" (meaning around) and "navigare" (meaning to sail). The word describes someone who sails around something, typically the globe.
Think of sailing 'around' ('circum-') while 'navigating' ('navigare') — that's why a circumnavigator is someone who sails around.
No commonly confused words.