There is no grammatical gender in the English noun. The word benefactress may be used for a female benefactor, but it is not necessary except to specify the person's gender, which of course is a form of sexism.
benefactress
Malefactor
Clot is not gender specific.
The opposite gender of fraternity is sorority.
The opposite of dairymaid is dairyman.
Mistress is the opposite gender of master.
benefactress
That would be a benefactress.
Benefactor is technically gender neutral, but benefactress is a specifically feminine form of the word.
Malefactor
Doctor is a neuter gender
Opposite gender of Filipino: Filipina
Clot is not gender specific.
Opposite gender of a Filipino: FILIPINA
The opposite gender of farmer is farmeress or farmwife.
An emperor is the opposite in gender to an empress.
The opposite gender of fraternity is sorority.
The opposite gender of giantess is giant.