The term 'Discordia's Greek counterpart' is referring to the goddess Eris, which can be found in the crossword solution with 4 letters. Eris is the Greek goddess of chaos, strife, and discord. She is the daughter of Zeus and Hera, and is often seen as a personification of the chaos that arises from conflict. She is also known for her role in the Trojan War, when she threw a golden apple into a gathering of gods and goddesses, leading to the famous Judgement of Paris.