Merriam-Webster's word of the day is
nemesis
pronounced NEM-uh-siss
a noun meaning
1
capitalized : the Greek goddess of retributive justice
2
plural: nemeses ˈne-mə-ˌsēz
a
: one that inflicts retribution or vengeance
b
: a formidable and usually victorious rival or opponent
3
plural: nemeses
a
: an act or effect of retribution
b
: BANE
In Greek mythology, Nemesis was the goddess of vengeance, a deity who distributed rewards for noble acts and punishment for evil ones. The Greeks believed that Nemesis didn't always punish an offender immediately; instead, she might wait generations to avenge a crime. In English, nemesis originally referred to someone who brought a just retribution, but nowadays it refers to a formidable rival.
(taken from Merriam-Webster)
To see it in context or listen to the pronunciation, check the link: https://www.merriam-webster.com/word-of-the-day (May 30, 2023)