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 then scroll through your list and remove any friends you no longer want in your list by clicking on the ‘Remove’ button that appears when you hover over thir name.
Source: https://www.devicemag.com/facebook-friends-list-iphone/