Wordpress Count how many each word in my post

I have 55K posts in my word press. I would like to count how many each word is in all of my posts. For example, I would like to know how many times the word "like" or "love" appeared in my 55K posts.

The purpose of this excerise is that I am using spintax. Spintax has its database of Thesaurus words. for Like it has 2 words (love, awesome) I want to create my own database of thesaurus. To do that, I want know if the word "like" exist in all of my post or not?

It will see down to your content box.

try these????
http://tools.seobook.com/general/keyword-density/

if you want wp plugins than these:
https://wordpress.org/plugins/tags/keyword-density/

keyword is... keyword density