General possibilities:
* Possibility: This is the most direct and common option.
* Potential: This emphasizes the capacity for something to happen.
* Chance: This implies randomness or luck.
* Option: This refers to a choice or alternative.
Specific possibilities:
* Prospect: This refers to a future possibility, especially a promising one.
* Opportunity: This refers to a favorable chance to do something.
* Likelihood: This refers to the probability of something happening.
Other options:
* Feasibility: This refers to whether something is practical or achievable.
* Viability: This refers to whether something is capable of surviving or succeeding.
The best noun to use will depend on the specific situation and what you want to communicate.