To avoid underlining individual words in the text (for example, proper names, abbreviations, special terms, and so forth), you can enter them in the Custom dictionary.
Before you start working with the dictionary, make sure that spell check is enabled in the application.
Add a word to the dictionary
You can only add individual words to the dictionary. Phrases and word combinations cannot be added.
The words in the dictionary are case-sensitive. If a word is spelled with both lowercase and uppercase letters, it is recommended to add both spellings of the word to the dictionary.
To add a word to the Custom dictionary directly from the text, follow these steps:
1.Place the mouse cursor or select the word you want to add to the dictionary.
2.Right-click the word directly in the cell or on the Formula bar.
3.Run the Custom dictionary command from the context menu.
To add a new word directly through the dictionary itself, follow these steps:
1.Open the Custom dictionary window in one of the following ways:
•Click the
button and run the Settings from the main menu. In the Settings pane, in the Spelling and grammar block, click Custom dictionary.

•On the Review tab, click
Spelling and grammar and run the Custom dictionary command.
•When working in macOS, select the Tools > Custom dictionary command from the command menu.
2.In the Custom dictionary window, enter the word to be added to the dictionary.

3.Click the
button or press Enter.
4.Click Done to finish editing the dictionary and close the dialog box.
Use third-party dictionaries
To expand the vocabulary available in the spreadsheet editor, you can add third-party dictionaries in .dic format. To do this, proceed as follows:
1.In the Custom dictionary dialog box, click Import.
2.In the file manager window, select the file with *.dic extension and click Open.
When finished, the file content will be displayed in the Custom dictionary.
Delete a word from the dictionary
You can remove a previously added word from the Custom dictionary.
To remove a word using the Custom dictionary window tools, follow these steps:
1.Open the Custom dictionary window in one of the following ways:
•Click the
button and run the Settings from the main menu. In the Settings pane, in the Spelling and grammar block, click Custom dictionary.
•When working in macOS, select the Tools > Custom dictionary command from the command menu.
2.In the Custom dictionary window, hover the mouse cursor over the word you want to delete from the dictionary and click
Remove.
3.Click Done to finish editing the dictionary and close the dialog box.

To delete a word without opening the Custom dictionary window, follow these steps:
1.Place the mouse cursor on the word or select the word you want to remove from the dictionary.
2.Right-click the word directly in the cell or on the Formula bar.
3.Run the Remove from dictionary command from the context menu.