We can use UB to refer to both. :)

> We can use UB to refer to both. :)

You can, but in the context of the standard, you'd be wrong to do so. Undefined behavior and unspecified behavior have specific, different, meanings in context of the C and C++ standards.

Conflate them at your own peril.

Maybe, but we were talking about "undefined behavior," not "UB," so the point is moot.