* The English language is constantly evolving: New words are created all the time, and old words fall out of use. There is no fixed endpoint.
* Dictionaries are snapshots: Dictionaries record the words in use at a particular moment, but they don't represent a complete or final list.
* Words are subjective: Even if we could agree on a definitive list, the "last word" would depend on what kind of list we're making (e.g., dictionary, slang, technical jargon).
So, while it's fun to think about the "last word," it's a concept that doesn't really exist!