"M'lady" is a term that was traditionally used to address a woman of noble birth. However, the term has evolved to be used as a term of respect for any woman. Some alternative synonyms for "m'lady" that can be used include "Madam," "Lady," "Ma'am," and "Miss." These terms are used as polite ways of addressing women and are commonly used in formal settings. While each synonym has its own history and connotation, they all share the same intention of showing respect and courtesy towards women. It is important to remember to use these terms appropriately and respectfully in order to promote understanding and equality.