General synonyms:
* Practicability: This is a very close synonym, emphasizing the possibility of doing something successfully.
* Viability: This emphasizes the ability of something to survive or succeed.
* Workability: This emphasizes the practical nature of something and its ability to be implemented.
* Possibility: This is a more general term, simply indicating that something is possible.
* Realizability: This emphasizes the ability to make something real or concrete.
More specific synonyms:
* Attainability: This emphasizes the possibility of achieving something.
* Achievability: Similar to attainability, but focuses on the ability to complete a task.
* Doability: This implies that something can be done without too much difficulty.
* Suitability: This emphasizes whether something is appropriate or fitting for a particular purpose.
* Justification: This emphasizes the reasons or evidence supporting the feasibility of something.
The best synonym for "feasibility" will depend on the specific context in which you are using the word.