Why can't we call a function directly from a function without passing it as a callback function?

For example:

WITHOUT CALLBACK

    function databaseQuery() {
      // A database query is run which let's say take 20 seconds
      x();
    }

    function x() {
      console.log("Hello world");
    }

WITH CALLBACK

    function databaseQuery(callback) {
      // A database query is run which let's say take 20 seconds
      callback();
    }
    function x() {
      console.log("Hello world");
    }
    databaseQuery(x);

FYI: I know there can be some factors like scope and other things but is there any SOLID functionality //that callback gives?

I tried Callbacks and normal function but got same result.

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