Dutchess would be the opposite of Earl.
A countess's male counterpart is a count or an earl (equivalent British nobility).(It's not really an opposite, just the opposite gender.)
The gender specific noun for a male is count.The corresponding gender specific noun for a female is countess.The gender specific noun for a male is earl.There is no corresponding gender specific noun for a female.
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.