Bachelorette (/ˌbætʃələˈrɛt/) is a term used in American English for a single, unmarried woman. The term is derived from the word bachelor, and is often used by journalists, editors of popular magazines, and some individuals. "Bachelorette" was famously the term used to refer to female contestants on the old The Dating Game TV show and, more recently, The Bachelorette. In older English, the female counterpart term to "bachelor" was "spinster".
https://en.wikipedia.org/wiki/Bachelorette