비판하다: to criticize, supported by facts and logic
비난하다: to reproach; to condemn
그 교수의 최근 논문은 학계로부터 많은 비판을 받았다.
The professor's most recent publication got heavily criticized by his academic circle.
내가 한 행동이 왜 비난받아야 하는지 모르겠다.
I don't understand why the action I took is reproachable.