archtraitor means A chief or transcendent traitor. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Why “archtraitor” is a great word
ARCHTRAITOR — [Noun] A chief or preeminent traitor. From the English prefix arch- ("chief, principal") + traitor ("one who betrays a trust or allegiance"). Unlike "turncoat," which implies an opportunistic defection, or "quisling," which denotes a specific collaborator with an occupier, archtraitor signifies a betrayal of supreme rank and magnitude—a treachery that organizes lesser ones. It is the defecting general who surrenders the capital's plans, the trusted chancellor who seals the secret pact, the first friend whose whispered secret dismantles a life. This is the architect of ruin, whose breach of faith becomes history's enduring verdict.
Etymology
From arch- + traitor.
noun
- A chief or transcendent traitor.“[…] that caitiffe Cardinall, and English Arch-traitor, from his Cannon of corrupt conceipt dischargeth two seditious Libels against his Souereign:”