While "defector" refers to someone who abandons their own country, organization or political party, "loyalist" can be considered its antonym as it refers to someone who remains faithful to the said ideology. Similarly, the term "ally" can also be used as an antonym of defector, as an ally signifies a person who is on your side and is supporting your cause or movement. Conversely, the term "traitor" can be used as a synonym of defector, as it denotes someone who goes against their country, group or organization. Additionally, the term "renegade" can also be considered a synonym of defector as it refers to someone who has betrayed their own group, organization or cause.