The term "other woman" is commonly used to describe a woman who is involved in a relationship with a man who is already in a committed relationship with another woman. While this term is widely recognized, it can be seen as derogatory and judgmental towards the woman involved. There are several other words and phrases that can be used to describe this situation without implying negative connotations. These include "mistress," "paramour," "lover," "significant other," or simply referring to the woman by name. It's important to use language that is respectful and avoids shaming or blaming anyone involved in a complex relationship dynamic.