Vim can handle abbreviations to replace some text by some other text. Question about creating these abbreviations and how to make them work.

From :h abbreviations:

Abbreviations are used in Insert mode, Replace mode and Command-line mode. If you enter a word that is an abbreviation, it is replaced with the word it stands for. This can be used to save typing for often used long words. And you can use it to automatically correct obvious spelling errors.