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.
This will open up the Notification Center, where you can toggle Do Not Disturb mode on or off.
Source: https://www.devicemag.com/do-not-disturb-mode-on-mac/