No, what I mean is not about this. I just mean it's so hard to find totally non-existent, let alone real unused words that even seemingly-random letter combinat

No, what I mean is not about this. I just mean it's so hard to find totally non-existent, let alone real unused words that even seemingly-random letter combinations turn out to be known words in some languages. For example I've used UntidyWelloffBellfrog just as a "seed" to remove random parts and get Udyber and Tyllog look more concise to me and which I would expect to be non-existent words. Yet it turns out these words exist and can be found all over the Internet.