Doctor is a neuter gender
Clot is not gender specific.
The opposite gender of fraternity is sorority.
An emperor is the opposite in gender to an empress.
Opposite gender of Filipino: Filipina
Opposite gender to negro is-- NEGRESS
The opposite gender is girl.
The opposite gender of giantess is giant.
The opposite of dairymaid is dairyman.
Parrot
Mistress is the opposite gender of master.
Cock's opposite gender is hen.