When working with a word file, the word by default will move down the next line when running out of the room. If you want to create uniform spacing, you can add hyphenation. Please see below for details:
Step 1: Click the "Layout" tab from the ribbon;
Step 2: Click "Hyphenation" and select "Automatic" from the drop-down list;
Step 3: Now you will see the hyphenation at the end of the line if the last word is long.