I just remembered we had a discussion in class if it is possible to say Bachelorette or not. Here is the result from Wikipedia:
Bachelorette is an informal, chiefly American term for a woman who is above the age of majority but is not married. It 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 Dating Game TV show.
In Canada, the term bachelorette also refers to a small bachelor apartment. The term bachelor apartment, used in Canada and South Africa, refers to an apartment with only one large room serving as a bedroom and living room plus a separate bathroom (see studio apartment).