For religious ministers:
* Convocation: This is often used for a gathering of ministers, especially for a religious event or conference.
* Clergy: This is a general term for ordained religious officials, including ministers, priests, and rabbis.
* Pastoral staff: This term is more specific and refers to the group of ministers working in a particular church or denomination.
For government ministers:
* Cabinet: This refers to the group of ministers who advise the head of government.
* Government: This is a general term for the group of ministers responsible for running a country.
* Ministry: This is the collective term for the department or agency headed by a minister.
Other options:
* Confraternity: This term is used for a group of people sharing a common religious purpose.
* Fellowship: This is a general term for a group of people sharing a common interest or purpose.
The best collective noun will depend on the specific context and the type of ministers you are referring to.