Arch-duchess is a title that refers to a female member of the Austrian or Habsburg royal family. Some synonyms for arch-duchess include princess, duchess, royal highness, noblewoman, lady, and queen. These terms are often used interchangeably to describe women of noble birth who hold positions of power or prestige within their respective countries or dynasties. The specific title used for a female member of royalty may vary depending on the culture and tradition, but all of these terms carry a sense of dignity and respect for those who hold them. No matter the title, all share a unique position of authority and influence in society.