Spill or spoil?

In this category, I don’t have to apologize for being off topic, so: a question to those who are more native english speakers than me: What is correct - spill board or spoilboard - or are they equivalent?

Spoil Board or Waste Board is What I hear most often.


Sacrificial Fundament of Workpiece Support and True Base Level of All That Is.

Or spoilboard. Depends on if it’s on fire…

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I’ve always heard of it as spoil board… as in where the spoils go… i.e. wastes… which is why it’s also sometimes called waste board…

I assumed it was called spoil because it gets spoiled. Or waste board because it ends up being trashed.