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.
All of this information is primarily discovered in the Swamps of Corsus DLC when players encounter the Graveyard Elf one of the last survivors that aren't infected by the Iskal.
Source: https://gamerant.com/remnant-ashes-beast-heart-choices-tips/