According to dictionary.com the definition of warrior is:
a person engaged or experienced in warfare; soldier.
a person who shows or has shown great vigor, courage, or aggressiveness, as in politics or athletics.
I see that the noun, person, is used, rather than a particular gender; it is neutral case. But then I see a movie entitled "Warrioress." Obviously it is about a female displaying martial prowess.
Regarding the movie title specifically, is warrioress (changing a neutral case word into a feminine case word) a real word?