First, you need to get value of p

let countVal = document.getElementById('wordCount');

Then, make an array from it by using split(separator)

let countArr = countVal.split(" ")

Finally, display it in your js

document.getElementById('someId').textContent = countArr.length;

You can use these codes:

For JS: document.querySelectorAll('#word')[0].textContent.length

For Jquery:

$("#word").text().length; 
$("#any").text().length; 

you have same value for class and id in html , change it if possible like this

<span class="Word" id="word">Words Number</span> <p class="Any" id="any">Here have some text which I want to count</p>

Then use this jQuery code

$(document).ready(function(){

var myString = $("#any").text();

var countWord = myString.split(' ').length;

});