There is none.
Some have suggested farmess or farmerette - neither is formal English.
farmer
The opposite gender of farmer is farmeress or farmwife.
a lady farmer.
Doctor is a neuter gender
The noun 'farmer' is a common gender noun, a word for a male or a female.
Clot is not gender specific.
There is feminine form of the word or job farmer. The tough work of a farmer has no real gender.
The opposite gender of fraternity is sorority.
An emperor is the opposite in gender to an empress.
Opposite gender of Filipino: Filipina
The opposite gender to "negro" is "negra" in Spanish, which translates to "black" and "black woman" respectively.
The opposite gender of boy is girl. Boys are male, while girls are female.
The opposite gender of giantess is giant.