synonym for traitor

Where did the word Quisling originate?

Quisling (/ˈkwɪzlɪŋ/, Norwegian: [ˈkvɪ̂slɪŋ]) is a term originating in Norway, which is used in Scandinavian languages and in English for a citizen or politician of an occupied country who collaborates with an enemy occupying force – or more generally as a synonym for traitor.

Quisling - Wikipedia