Watchwoman is a gender-specific term for a female who fulfills the role of a watchman or security guard. If you're looking for synonyms to use in place of watchwoman, you might consider terms like security officer, guard, sentinel, sentry, or keeper. These words all convey a sense of guardianship and protection, and could be used in a variety of contexts to describe someone who is responsible for ensuring the safety of a particular place or group of people. Alternative phrases might include security personnel, security detail, or simply security team. Whatever term you choose, it's important to remember that these people play a crucial role in keeping us all safe and secure.