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.
For Touch ID-enabled iPhones, lightly double-tap the Home button to do the same.
Source: https://www.slashgear.com/1232211/hidden-iphone-features-that-are-complete-game-changers/