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 help you remember and keep up, the app has a spaced-repetition system where difficult words are repeated often and sorted into learning levels.
Source: https://www.freepressjournal.in/weekend/5-apps-that-will-help-you-improve-your-vocabulary