해외foreign country; overseas 해외여행overseas travel; trip abroad 외국foreign country 외국어foreign language 외국인foreigner 외출going out; outing 과외extra work 교외suburb; outskirts 교외out-of-school; off-campus 국외outside a territory

환전foreign exchange; money exchange 교환exchange 환기ventilation 환승transfer; change 환승역transfer station; interchange station 환율exchange rate 환전소currency exchange counter 교환권exchange ticket 치환substitution; replacement 호환compatibility; interchangeability