nemeses

/N EH1 M AH0 S IY0 Z/
noun
  1. 1

    An archenemy

    โ€œBatman is in constant conflict with his nemesis, The Joker.โ€

  2. 2

    (chiefly non-North American usage) A person or character who specifically brings about the downfall of another person or character.

  3. 3

    The principle of retributive justice.

  4. 4

    (usually in the singular) A punishment or defeat that is deserved and cannot be avoided.

  5. 5

    The polar opposite of a character.

  6. 6

    A righteous infliction of retribution manifested by an appropriate agent.

Source: https://en.wiktionary.org/wiki/nemeses, https://en.wiktionary.org/wiki/nemesis