A family of Microsoft word processing software products for creating web, email, and print documents.
You can simply turn them off by choosing File>Options>Proofing and unchecking the option Check spelling as you type. Or you can select the words that have red wavy underlines and either:
- right-click on the word and choose Add to Dictionary, or
- choose Review>Language>Set Proofing Language and check the option Do not check spelling or grammar.
The last step is the only one that will travel with the document, in case this is a file you will be sending elsewhere.