Scourge
Part of speech: verb
Definition: To strike with a scourge.
Part of speech: noun
Definition: A persistent pest, illness, or source of trouble, (figurative) cause of suffering to people. A whip often of leather.
Example sentence: Baneful indeed is the scourge of war.
Nemesis
Part of speech: noun
Definition: An archenemyThe principle of retributive justicePunishment or defeat that is deserved and cannot be avoided(Greek Mythology) The goddess of divine retribution and vengeance (always capitalized)The polar opposite of a characterA righteous infliction of retribution manifested by an appropriate agent