Select the most appropriate one-word substitution for the given group of words.

Downfall that satisfies natural justice

nemesis

The most appropriate one-word substitution for "downfall that satisfies natural justice" is nemesis. It means "a person or thing that brings about another's downfall, especially as a punishment or just deserts." The other options are incorrect.

• Paradox means a statement that seems to contradict itself but may actually be true.
• Climax means the most intense, exciting, or important point of something.
• Catharsis means the process of releasing and thereby providing relief from, strong or repressed emotions.