The phrase "point of honor" can be interchanged for a number of synonyms depending on the context of the situation. Some of the synonyms include: principle, pride, ego, integrity, reputation, dignity, and respect. Each of these synonyms captures a different nuance of the original phrase. For example, "principle" emphasizes the idea of a moral code that one adheres to, while "ego" suggests a sense of personal importance and pride. "Integrity" emphasizes the importance of being true to oneself, while "dignity" and "respect" suggest an expectation of being treated as one deserves. In any case, these synonyms all suggest a deep sense of personal commitment and determination to protect one's honor.