This tip comes from WordRibbonTips:
While editing documents, it is not uncommon to delete words, phrases, and the like. Different people take different approaches to the task. For instance, some people just select the text and press Delete, while others may simply hold down the Delete or Backspace keys until the unwanted characters disappear.
If you are in the latter group, and you spend a lot of time pressing Delete or Backspace, you may be interested in a handy shortcut provided by Word. All you need to do is hold down the Ctrl key to speed up your deletions. Using Ctrl+Delete deletes text from the insertion point to the end of the next word. For instance, if you wanted to delete four words to the right, simply press Ctrl+Delete four times. Likewise, Ctrl+Backspace deletes words to the left of the insertion point.
An interesting use of these shortcut keys is to speed up editing tasks, not just mass deletions. For instance, let’s say you wanted to change the word “sidestep” to “sideways.” Normally you would find some way to simply delete “step” and type “ways.”
This could involve pressing Delete or Backspace four times to get rid of the unwanted portion of the word. You can make your edit faster if you just position the insertion point at the beginning of “step,” press Ctrl+Delete once, and then type “ways.”