Common words:
* Epiphany: This is a classic choice, often used for a sudden realization of a deeper truth or meaning.
* Realization: This is a more general term, but still conveys a sudden grasp of something previously unknown.
* Insight: This implies a deeper understanding gained through reflection or intuition.
* Aha moment: This is a playful and colloquial term, often used for a sudden breakthrough or solution.
More specific options:
* Cognizance: This word emphasizes the act of becoming aware of something.
* Illumination: This suggests a sudden clarity or enlightenment.
* Revelation: This implies a sudden and dramatic unveiling of something hidden.
* Flash of understanding: This is a more descriptive phrase that captures the quickness of the realization.
The best word to use depends on the context and the specific meaning you want to convey.