The word "archfoe" is a strong and derogatory term used to describe an enemy or opponent who is seen as the main adversary. Some synonyms for "archfoe" could include "nemesis," "rival," "adversary," "foe," "antagonist," "opponent," "enemy," "challenger," "opposer," or "competitor." These terms are often used in various contexts, such as in politics, sports, or everyday life. While they may not carry the same level of intensity as "archfoe," they still convey a sense of opposition and competition. It's important to remember to use language carefully and thoughtfully, especially when discussing difficult or contentious topics.