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

한국Korea 한국어Korean (language) 국어national language 국민citizen 출입국departure; entry 국가nation 출국leaving a country 입국entering a country 국왕king (of a nation) 왕국kingdom

체계system 체계성system 체계적being systematic 체계적systematic 체계화systemization 태양계solar system 가계lineage; family 계보genealogical record; table of descent; history of family 계열system; faction; department 계열사affiliate