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.
You can do this by clicking on the Finder icon in the Dock or by pressing Command+Space and typing “Finder” in the Spotlight search.
Source: https://www.devicemag.com/contacts-not-showing-on-mac/