General possibility:
* Chance: This implies a random or uncertain possibility.
* Potential: This suggests a possibility that could be realized.
* Prospect: This implies a hopeful or desirable possibility.
* Opportunity: This emphasizes a possibility that presents itself.
More specific possibilities:
* Feasibility: This focuses on whether something is possible to do or achieve.
* Probability: This quantifies the likelihood of a possibility.
* Contingency: This describes a possibility that depends on other factors.
The best choice will depend on the specific context of your writing.