* Freedom: This is the most common abstract noun for "free," representing the state of being unrestrained or independent.
* Liberty: Similar to freedom, it emphasizes the absence of restrictions and the right to act freely.
* Emancipation: This refers to the act of freeing someone from slavery, oppression, or control.
* Exemption: This noun indicates a state of being free from a duty, obligation, or requirement.
The best choice will depend on the specific context and what you want to emphasize.