Pentheraphobia, also known as fear of a mother-in-law, is a common phobia that affects many individuals. However, there are various synonyms that can be used to describe this fear. Some of the synonyms for pentheraphobia include Surophobia, which is fear of a mother-in-law's interference in a couple's marriage; Novercaphobia, which is the fear of stepmothers; and Myrophobia, which is fear of one's mother-in-law criticizing or disapproving of them. These synonyms highlight the varied aspects of the fear of a mother-in-law, including interference, disapproval, and criticism. Regardless of the synonym used, it is essential to recognize and address the fear to avoid any negative impact on one's mental health and relationships.