IPA: /ˈɑːrʧfoʊ/
KK: /ˈɑːrʧfoʊ/
A main enemy or opponent, often one that is particularly significant or important in a conflict or rivalry.
The superhero faced his archfoe in a final battle to save the city.
Archfoe → It is formed from "arch-" (from Greek "archos", meaning chief or principal) and "foe" (from Old English "fāh", meaning enemy). The word "archfoe" refers to a principal or chief enemy.
Think of 'arch-' meaning chief and 'foe' meaning enemy — this helps you remember that an archfoe is a chief enemy.
No commonly confused words.