Masseur is masculine, masseuse is feminine.
Masseuse
the opposite of masseuse is masseur
masseuse
Masseuse
The feminine gender of "votary" is "votress."
The feminine gender of "Dutch" is "Dutchess."
The feminine gender of "don" is "dona."
The feminine gender for "negro" in Spanish is "negra."
The feminine gender for the word "heir" is "heiress."
The feminine gender of tutor is "tutora" in Spanish.
There isn't one... the word 'enemy' has no gender.