What is the collective noun of wood?

There isn't really a widely accepted collective noun for wood.

Here are some options, depending on the context:

Formal:

* Pile of wood

* Stack of wood

* Heap of wood

Descriptive:

* Stand of timber (if referring to trees)

* Forest of trees (if referring to trees)

* Batch of lumber (if referring to processed wood)

Ultimately, the best collective noun will depend on the specific type of wood and the situation you're describing.