Margaret Sanger was a pioneering American birth control activist, nurse, and sex educator who founded the birth control movement in the United States. She is regarded as the founder of the modern birth control movement and is renowned for her advocacy of women's reproductive rights. Some commonly used synonyms for Margaret Sanger include birth control advocate, family planning pioneer, and women's health advocate. Other synonyms include reproductive rights activist, contraception crusader, and sex education trailblazer. Margaret Sanger's legacy lives on through various organizations and initiatives that continue to promote reproductive health and rights worldwide.