WORD: EXCEL: Automatically replace text in the document

12: Automatically replace text in the document — for example, you can replace "Tom" with "Tommy"

Ctrl + H opens the Find and Replace dialog box. This can be used to FIND specified characters in the document and REPLACE it with what we want. 

Try it out.

Note: Ctrl + F is used just to Find text in the document, Ctrl + H to Find and Replace.