> mine and OP's point is that a better choice of words can avoid these debates and make the world a little less ambiguous.

If you changed the words to different ones, we would just be having a different debate, because two words cannot resolve the inherent complexity of the subject matter. It would still be ambiguous because the concepts themselves are too complex to address in two words. You would, however, feel like they were simpler, because you chose simpler words that only cover a small fraction of the overall subject matter. This is a self-deception; you'll feel safer in your understanding of what's going on, but you will still have the same problems when trying to use them in different cases. Call it "login" or "jskjfhskjdf", your experience in doing engineering with them will be the same.

("login" does not encompass everything that is authentication, and "permissions" does not encompass everything that is authorization. there are "authentication permissions" and "authorization permissions", and some systems authenticate without "logging in". so you're still going to be confused later on with this choice of words, even if they had the same definitions as the current words)