Explanation

Defenestration (n.) –

The act of throwing someone or something out of a window; metaphorically, a sudden removal from power.

Sentence:

The dictator’s brutal policies led to his defenestration, as enraged citizens stormed the palace and overthrew his rule.

Dénouement (n.) –

The final resolution or conclusion of a narrative, where conflicts are resolved.

Sentence:

The movie’s dénouement was unexpected, revealing that the protagonist had been the villain all along.