On this matter though I am afraid you are wrong.
I think perhaps we’re both right. Certainly, most words DO have clearly defined meanings, or at least definitions even if unclear, but these are just nominal, and subject to continual elision and redefinition
My central thesis in this, as in so many other topics, is that if you concentrate on the minutiae of a process or thing, you can easily miss the point of it. So, for example, unless you are only using language to sound good, picky details about the exact form of expression are irrelevant, and would better be ignored, as in speech, which is often littered with errs, umms, and mistakes. And with language, the distortions are fundamental to its development. New words are either made up on the fly or hammered out of old ones, and new arrangements (grammar) also emerge, or are copied from other languages, partly because younger people want to sound different to (and wind up) their elders 🙂