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.
Once you have your CSV file, you'll need to convert it into a vCard or VCF file.
Source: https://www.devicemag.com/restore-yahoo-contacts-to-iphone/