When you want to look at two documents simultaneously to compare their content, Word will place the documents in adjacent windows. If the documents are similar enough, you can have Word scroll through both of them at the same time, or you can scroll through the documents one at a time.
Open the two documents you want to view and compare.
On the View tab, in one document, click the View Side By Side button.
If a dialog box appears and asks you which document you want to view, select the document you ...