You can manually check the spelling of a text selection or the entire document.
To check the spelling and the grammar of a text, the appropriate dictionaries must be installed. For many languages three different dictionaries exist: a spellchecker, a hyphenation dictionary, and a thesaurus. Each dictionary covers one language only. Grammar checkers can be downloaded and installed as extensions. See the extensions web page.
The spelling check starts at the current cursor position, or at the beginning of the text selection.
Click in the document, or select the text that you want to check.
Choose Tools - Spelling.
When a possible spelling error is encountered, the Spelling check dialogue box opens and LibreOffice offers some suggested corrections.
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To accept a correction, click the suggestion, and then click Correct.
Edit the sentence in the upper text box, and then click Correct.
To add the unknown word to a user-defined dictionary, click Add to Dictionary.