Thesaurus

You call someone a traitor. That is a heavy word. It carries the full weight of broken allegiance, of trust shattered. But the English language offers dozens of words for people who turn against their country, their party, or their friends. The right synonym can sharpen an accusation or soften it. It can aim at a specific kind of betrayal. Thesaurasize has a deep list of traitor synonyms. Here is how to use them.

What "traitor" actually means

A traitor is someone who violates allegiance and betrays their country. That is the core definition. The word comes from Old French traitor, from Latin traditor (a betrayer), related to tradere (to hand over). The idea is handing something over to an enemy. You can be a traitor to a nation, a cause, a family, or a friend. But the strongest sense is political or military betrayal.

The strongest synonyms, grouped by meaning

Political and military traitors

These words carry the full legal and historical weight of treason.

Benedict Arnold is a proper name used as a synonym. It is specific and loaded. Benedict Arnold was an American general who plotted to surrender West Point to the British in 1780. The name works when you want to say someone is the worst kind of political traitor. Example: "The party saw him as a Benedict Arnold, selling out his own campaign team." Use it only for obvious, high-stakes treason. Otherwise it sounds melodramatic.

Judas comes from Judas Iscariot, who betrayed Jesus for thirty pieces of silver. It carries religious and moral overtones. Use it for a betrayal by a close associate, especially for money or small gain. Example: "He was a Judas to the movement, leaking secrets to the press for a few dollars."

Archtraitor is rare and formal. It means a chief traitor, the worst of them. Use it in historical writing or in dramatic accusations. Example: "The court condemned him as an archtraitor, the man who sold the nation to its enemies."

Double agent is specific to espionage. A double agent works for one intelligence agency while secretly working for another. It is a job description, more than an insult. Example: "MI6 discovered the double agent feeding information to Moscow." Use it only when speaking about spies.

Fifth columnist refers to someone who works secretly to undermine a nation from within. The term originated in the Spanish Civil War when General Mola said he had four columns attacking Madrid and a fifth inside the city. It is a cold, strategic word. Example: "The editor of the newspaper was a fifth columnist, running propaganda disguised as news."

Betrayers in personal or group settings

These words are less political and more about broken trust between individuals or within small groups.

Betrayer is the most direct synonym. It lacks the legal gravity of "traitor" but covers any broken trust. Example: "She was a betrayer of every confidence her friends shared." Use it when the betrayal is personal, not treasonous.

Double-crosser is informal and strong. It means someone who pretends loyalty then switches sides. Example: "He shook hands on the deal, then turned out to be a double-crosser." Use it in casual or angry contexts.

Defector is neutral in tone. A defector leaves one side to join another. It is not always a moral judgment. Example: "The athlete was a defector from the state-run team, seeking freedom to compete abroad." Use it when the person changed sides openly.

Backslider is milder. It comes from religious language and means someone who reverts to old habits or beliefs after making progress. It is not exactly a traitor, but it fits when someone abandons a cause they had adopted. Example: "The party called him a backslider for voting with the opposition." Use it with condescension, not rage.

Collaborator and collaborationist are loaded words from wartime. A collaborator works with an enemy occupier. It carries shame and complicity. Example: "She was tried as a collaborator after the war for running a restaurant that served German officers." Use it strictly in occupation contexts. "Collaborationist" is even stronger, implying ideological support.

Informal and scornful synonyms

These words are insults, often with a whiff of criminality or low character.

Informer is a person who gives information to authorities, often against a group they belong to. It is neutral in law but a term of contempt among criminals. Example: "The mobster was killed because someone suspected him of being an informer."

Snitch is the informal version of informer. It is schoolyard slang. Use it when the betrayal is petty or the setting is informal. Not for serious political treason.

Turncoat means someone who changes sides, from a historical practice of turning a coat inside out to show the other uniform. It is a good all-purpose word for a political or personal switch. Example: "After the election, the turncoat joined the winning party." It implies opportunism more than evil.

Rat is a blunt insult for someone who betrays confederates. Use it in tough-guy talk. Example: "He ratted on his partners to save himself."

Words people mix up with "traitor"

People confuse "traitor" with rebel or insurgent. A rebel fights against the established government but does not necessarily owe it allegiance. A traitor breaks an oath of loyalty; a rebel may never have sworn one. An agitator stirs up political unrest but may stay loyal to a cause. A conspirator plots secretly but is not always a traitor. The difference is allegiance.

Antonyms

The direct opposite of a traitor is a patriot, someone who loves and supports their country. In smaller contexts, a loyalist or a stalwart stays faithful. A friend is the opposite of a personal betrayer.

Frequently asked questions

What is the difference between a traitor and a deserter?

A deserter leaves military service without permission. It can be a form of cowardice or protest. A traitor actively works against their own side. Desertion is a crime of absence; treason is a crime of action against. You can be a deserter without being a traitor, though both break allegiance.

Is "traitor" a legally defined term?

Yes, in the United States and many countries, treason is a specific crime defined in the constitution or statute. In the U.S., Article III, Section 3 says treason against the United States consists only in levying war against them, or in adhering to their enemies, giving them aid and comfort. Conviction requires two witnesses or a confession in open court. That is a much narrower definition than everyday use. Not every traitor in conversation would be a traitor in court.