Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
However, you can purchase eiter of these software suites separately as part of the Microsoft 365 or Office Suite packages.
Source: https://www.devicemag.com/excel-spreadsheet-on-macbook-air/