A family of Microsoft word processing software products for creating web, email, and print documents.
When text is justified in Word, it will vary the space between words, but this is an automatic process that you can't control. But you can insert wider space characters using Unicode fonts. To insert an Em space, press the Numlock key on your keyboard. Then, on the numeric keyboard, type 2003. Finally, press Alt + X on the keyboard. 2003 is converted to an Em space, which is 4 or 5 times wider than a regular space character.
You could create an Em space, then save it as AutoText or a Building Block. Then you can assign a custom keyboard shortcut to it to make it quick to enter in a score.
Here is Microsoft's page on inserting Unicode characters from the keyboard. And here is a Wikipedia page showing the variety of white space characters you can insert.