In these days of gender equality the word 'founder' is generally used for people of either gender. In the past, many ~er and ~or word endings were feminised by changing them to ~ress - so founder would have been foundress.
Doctor is a neuter gender
Opposite gender of Filipino: Filipina
Clot is not gender specific.
Opposite gender of a Filipino: FILIPINA
There isn't an opposite gender of farmer. A farmer can be either a male or a female.
An emperor is the opposite in gender to an empress.
The opposite gender for Joseph is Josephine.
The opposite gender of giantess is giant.
The opposite of dairymaid is dairyman.
The feminine gender of founder is foundress.
gentlewoman....
Mistress is the opposite gender of master.