Archnemesis is a synonym of archenemy.
As nouns the difference between archenemy and archnemesis
is that archenemy is a principal enemy while archnemesis is a chief {{l/en|nemesis}}.
archenemy
English
Alternative forms
* arch-enemy
Noun
(archenemies)
a principal enemy
Synonyms
* (l)
See also
* (l)
* (l)
archnemesis
Noun
(archnemeses)
A chief .
Synonyms
* archenemy
* archfoe
* archvillain