General:
* Purity: This is the most direct and common noun for "pure."
* Immaculateness: This suggests absolute cleanliness and freedom from blemish.
* Spotlessness: This emphasizes the lack of any imperfections or stains.
* Innocence: This implies a state of being free from guilt or evil.
* Virtue: This suggests moral purity and goodness.
Specific:
* Refinement: This refers to purity in the sense of elegance and sophistication.
* Clarity: This refers to purity in the sense of being clear and transparent.
* Authenticity: This refers to purity in the sense of being genuine and unadulterated.
The best option will depend on the context and the specific meaning you want to express.