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 earl is a title for a male person, there is no equivalent for this title for a female. The female partner of an Earl (or a female Earl) was called Lady. If she also held the title herself then she was called the Earl of whatever place.
An emperor is the opposite in gender to an empress.
The opposite gender of giantess is giant.
The opposite gender for Joseph is Josephine.