In the pop-up menu that opens, select Spelling, then the Add to Dictionary option.

Right-click the word with a red squiggly line under it. As you are typing text in the document, any words that Microsoft Word considers to be misspelled have a red squiggly line underneath them. In the Add Custom Dictionary dialog box, select the dictionary and click the Open button: The new custom dictionary is added: Note: To delete a custom dictionary, select it in the Custom Dictionaries dialog box and click the Remove button.Click the OK button on each of the open windows to save the dictionary changes.Click the Add button to add the word to the Microsoft Word dictionary.

Type the word you want to add in the Word(s) text field.

In the Custom Dictionaries window, select the dictionary set as the default dictionary, then click the Edit Word List button.

Under the When correcting spelling in Microsoft Office programs header, make sure the box is unchecked for the Suggest from main dictionary only option.

In the Word Options window, click the Proofing option in the left navigation pane.

In the menu bar, click the File tab, then click Options.

Add new word through a custom dictionary.

Excel for Microsoft 365 Word for Microsoft 365 Outlook for Microsoft 365 PowerPoint for Microsoft 365 Access for Microsoft 365 Project Online Desktop Client Publisher for Microsoft 365 Visio Plan 2 Word for Microsoft 365 for Mac Word for the web Excel 2021 Word 2021 Outlook 2021 PowerPoint 2021 Access 2021 Project Professional 2021 Project Standard 2021 Publisher 2021 Visio Professional 2021 Visio Standard 2021 OneNote 2021 Word 2021 for Mac Excel 2019 Word 2019 Outlook 2019 PowerPoint 2019 Access 2019 Project Professional 2019 Project Standard 2019 Publisher 2019 Visio Professional 2019 Visio Standard 2019 Word 2019 for Mac Excel 2016 Word 2016 Outlook 2016 PowerPoint 2016 Access 2016 OneNote 2016 Project Professional 2016 Project Standard 2016 Publisher 2016 Visio Professional 2016 Visio Standard 2016 OneNote for Microsoft 365 Word 2016 for Mac Excel 2013 Word 2013 Outlook 2013 PowerPoint 2013 Access 2013 OneNote 2013 Project Professional 2013 Project Standard 2013 Publisher 2013 Visio Professional 2013 Visio 2013 Excel 2010 Word 2010 Outlook 2010 PowerPoint 2010 Access 2010 OneNote 2010 Project 2010 Project Standard 2010 Publisher 2010 Visio 2010 Visio Standard 2010 Office 2010 Excel 2007 Word 2007 Outlook 2007 PowerPoint 2007 Access 2007 Project 2007 Publisher 2007 Visio 2007 More.

How add custom dictionary in word 2016