The French word "mademoiselle" is a term used for an unmarried woman or a young lady. However, there are several other words that can be used as synonyms for "mademoiselle." The word "demoiselle" is often used to refer to a young lady or a maiden, while "miss" is a common English equivalent of the term "mademoiselle." "Madame" is another French term that can be used for a married woman. "Ms." is a gender-neutral term that can be used instead of "miss" or "mademoiselle," while "maiden" and "lass" are also used to refer to young women. In short, there are several words that can be used as synonyms for "mademoiselle" depending on the context and the speaker's preference.