The words needed to define a universal turing machine (and a program to simulate a human brain, but that doesn't require additional words).
We could extend it to cover words not conceivable by humans, and any universe, by using a program to simulate those, but (1) I assume the question implicitly assumes human words, though (2) it wouldn't require more words anyway.
We could extend it to cover words not conceivable by humans, and any universe, by using a program to simulate those, but (1) I assume the question implicitly assumes human words, though (2) it wouldn't require more words anyway.