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.
The pink blade represents Love, which may seem kind of abstract when put together with the other blades, but it has an explanation: the Love Breathing has a peculiar nature, and it was developed by the pink Nichirin blade wielder herself, Mitsuri Kanroki.
Source: https://collider.com/demon-slayer-sword-colors-explained/