What is the collective noun of preachers?

There isn't a widely accepted collective noun specifically for preachers. However, here are a few options you could consider:

Formal/General:

* A congregation of preachers

* A fellowship of preachers

* A body of preachers

* A group of preachers

More informal/specific:

* A chorus of preachers (emphasizes the preaching style)

* A band of preachers (implies a group working together)

* A flock of preachers (evokes the image of shepherds guiding their flock)

Ultimately, the best collective noun will depend on the specific context and the desired effect.