Unique Random Username Generator - URUG - Generate true random, catchy and free-of-numbers usernames

Hi, I made this small project. This username generator creates truly random "made-up" words that are completely unique, original, and even catchy. I used the rules of real-life words like the building blocks of syllables (onset, nucleus, and coda) to create a way to just create actual made-up words that aren't just random strings and are actually pronunciable and, by that, easier to remember. To add more "catchiness," I also made a small random (real) word API that concatenates with the made-up words. In the end you have a completely original name, so it's almost guaranteed that nobody has used it on any social media or video games. Let me know what do you think? What Improvements should I do? Are there better ways to create made-up words?