Comparing two versions of a word file is quite easy in MS Word. Here goes the steps:
1) Open the original document.
2) Go to ‘Tools’ menu and then click ‘Compare and Merge Documents’. For the newer versions of MS Office ‘Compare and Merge Documents’ is under Review > Compare > Compare
3) In the ‘Open’ dialog, point to the newer version of the document, and click open.
4) And you are done.