"Mumsies" is a somewhat outdated term that refers to a mother or a mother figure. There are various synonyms for this term that are often used to express the same sentiment. Some of the commonly used synonyms for "mumsies" are mom, mama, mother, mum, mommy, ma, mater, and maternal figure. Depending on the context and the tone of the conversation, one may choose to use any of these synonyms instead of "mumsies." In the end, what matters most is that the speaker conveys their respect, affection, and appreciation for the mother or mother figure in their life.