There are several synonyms for the word "abandoner," including deserter, traitor, renegade, defector, runaway, runaway, and orphan. A deserter is someone who abandons their military or official duties. A traitor is someone who betrays their friends or country. A renegade is someone who abandons their previous beliefs or principles. A defector is someone who switches sides or allegiances. A runaway is someone who runs away from their obligations or responsibilities. Lastly, an orphan is someone who is left without parents or guardianship. These words all share the common theme of someone who has decided to leave behind something important or meaningful.