Huldreich Zwingli was a Swiss theologian and reformer who played a crucial role in the Protestant Reformation. He was a contemporary of Martin Luther and John Calvin but had his unique ideas and perspectives. Some synonyms that can be used to describe Zwingli include a religious leader, reformer, theologian, preacher, pioneer, and innovator. Zwingli was known for his powerful sermons, advocacy for the Bible's authority, and his attention to social and political issues. He also promoted the importance of an individual's relationship with God and was a strong proponent of religious freedom. Today, he is remembered as an influential figure in the history of Christianity and the Reformation movement.