부자 = rich person 재벌 (1) conglomerate [company] (2) (informal) The person who owns conglomerate. (예) 그 사람 재벌이야. In general, '재벌' is richer than '부자'. 졸부 = the nouveau riche / people who have recently become rich and like to show how rich they are in a very obvious way (예) 그 사람 졸지에 돈을 번 졸부야.