Parts of string to special json format

foreach (var word in words) {
    Console.WriteLine($"word = {word}");

    // word = string of characters like :

    // hello
    // hello world
    // hello world test
    // world
    // w (alias of world)
    // ...
}

{
    "hello": {
        "world": {
            "_usage": "hello world",
            "test": {
                "_usage": "hello world test"
            }
        }
    },
    "world": {
        "_alias": "w",
         "_usage": "(w)orld"
    },
    // etc ...
}