Those questions, unfortunately, make little sense without the context. UrW does not have "core wood", nor "block pot", so these terms are presumably introduced by the mod(s) you're trying to use. Questions about how different mods work are better asked in their respective threads.
The answers to the questions can be found in the combined knowledge of how items defined by UrW work and how the mods use the "real" items to create modded versions of them, so it requires both UrW knowledge and knowledge of how to interpret what the mod recipes do. As I suspect it may be beyond for your current knowledge level, your options are to ask in the thread(s) and delve into the mods to figure it out yourself.