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.
However, this minigame is not available in the Master Collection or the HD Collection.
Source: https://gamerant.com/metal-gear-solid-master-collection-secrets-easter-eggs/