Apologetics is my favorite word
The word apologetics is so great. It has a common root with apology. And apology is a contronym, meaning it has two definitions that are opposite to each other:
apology - 1. admission of fault in what you think, say, or do; 2. formal defense of what you think, say, or do
I think apologetics is a parallel contronym. The definition depends on whether you're a theist or not.