What is the synonym for word betrayer?

Here are some synonyms for "betrayer", depending on the specific context you're looking for:

General Synonyms:

* Traitor

* Treacherous

* Deceitful

* Double-crosser

* Backstabber

* Turncoat

* Renegade

More Specific Synonyms:

* Infidel: (For betrayal of religious faith)

* Apostate: (For betrayal of a cause or belief system)

* Perjurer: (For betrayal of a promise or oath)

* Rat: (Informal term for someone who betrays a group or organization)

* Snitch: (Informal term for someone who informs on someone else)

The best synonym for you will depend on the specific situation and the tone you want to convey.