I would like to be able to count the words that are most used in
documents. Please advise how I can do this?

So you can understand why I want to do this .... I plan to write
minutes with a digital pen that converts handwriting to digital format
using OCR. I will then cut and paste this into Word.

I want to abbreviate the most common words from previous committee
meetings and put these into autocorrect in word.

For example, if I then wrote during the meeting:

Th cmte wlcmd th pstv fdbk rcvd.

This could be converted to the correct full length words and would then
read as:

The committee welcomed the positive feedback received.

The latter stuff is simply to put into context what I am trying to do.

Cheers!