What is the collective noun for rumors?

There isn't a single, universally accepted collective noun for rumors. However, here are some options you can use depending on the context:

Formal:

* A whirlwind of rumors

* A wave of rumors

* A flurry of rumors

* A cloud of rumors

* A tide of rumors

* A network of rumors

Informal:

* A buzz of rumors

* A grapevine of rumors

* A whisper campaign

* A lot of talk

* A lot of hearsay

Ultimately, the best collective noun for rumors depends on the specific situation and the tone you want to convey.