What is another word for sworn enemy?
Pronunciation: [swˈɔːn ˈɛnəmi] (IPA) 
A sworn enemy is someone who harbours deep, often irreconcilable hatred towards another. There are several synonyms that can be used to describe a sworn enemy, including archenemy, nemesis, adversary, antagonist, foe, rival, combatant, and challenger. An archenemy is a particularly formidable opponent who poses a great threat to someone's success, whereas a nemesis is a person who is actively seeking retribution. An adversary is someone who acts in opposition to another, while an antagonist is a person who actively opposes the protagonist in a story. A rival is someone who competes against another for the same goal, while combatant and challenger are those who engage in physical or ideological conflict.
