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.
To do so, all you need to do is shut down your computer and hold down the “Command-Option-P-R” keys immediately after you turn on your computer.
Source: https://www.devicemag.com/does-resetting-nvram-delete-data/