What is the collective noun for yarn?

There isn't a widely accepted or commonly used collective noun specifically for yarn.

However, you could use some creative options like:

* Skein of yarn

* Ball of yarn

* Bundle of yarn

* Heap of yarn

* Pile of yarn

You could also get creative and use a noun that evokes a specific image or feeling, such as:

* Cloud of yarn

* Rainbow of yarn

* Nest of yarn

Ultimately, the best collective noun for yarn depends on the context and the desired effect.