Cork is the bark of the cork oak. When people speak of wood they don’t usually mean bark.
I was just coming back to say that!
The first definition of cork I looked at described it as bark, and the first definition of bark I read said it surrounded the woody stems and roots of trees.
I didn’t check whether botanists, etc. include bark in the definition of wood… in common usage they’re distinct.
Damnit, I love this. Way too much. I could play this for hours