Word 2013 and Word 2010 have a feature that allow users to hide or unhide text in a document. This is a neat and simple trick to hide important text in your word document (but not very secure though). Listed below are the steps to hide text in a document
Step 1: Select the text or sentences or paragraphs to hidden.
Step 2: Click the customize option under Font Ribbon.
Step 3: In the Font dialog window, navigate to Effects section.
Step 4: Mark the check box with caption as Hidden then click Ok button to confirm and save the changes.
Now this should hide the selected sentences or paragraphs in the document. To unhide a hidden sentences, repeat the above steps and uncheck the Hidden check box.