Propugner is an uncommon word that means to defend or support a particular idea or cause. However, there are many other words that can be used instead of propugner. Some synonyms include advocate, champion, uphold, promote, endorse, espouse, defend, back, vindicate, and support. Each of these words holds a similar meaning to propugner, emphasizing the act of standing up for a belief or cause. For example, one might advocate for animal rights, uphold democracy, or defend their friend's reputation. Using alternate synonyms for propugner allows for creative and varied language use, adding depth and clarity to writing and conversation.