Words inventor is an application that does what its name indicates, that is, it invents words that do not exist.
You can use it to inspire you if you have to create the name of a new product, or for example choose the name of your music group and make it original, since the word does not exist you make sure that no one has used the same name before,
It can also be useful if you are writing a story and you want to make up names of characters or places, you could make up your own language, like the elven languages of the Lord of the Rings!, Or you can just use it for fun, some words can really sound fun :).