In English there are no masculine or feminine forms. English uses gender specific nouns for a male or a female, such as male and female.
A gender noun for a female who does laundry is laundress.
In the US, since females have been hired as 'postmen', the name 'letter carrier' or 'mail carrier' has been applied to that job. The idea of adding a feminine form for postman was rejected in lieu of making that job title generic.
In the 1960s, I was hired for the holiday crunch at our local post office. At that time, females could only work jobs inside the post office and were not allowed to work the higher paying mail route jobs so there was no term for a female letter carrier.
Laundress or laundrywoman.
janitor
Clot is not gender specific.
The opposite gender of fraternity is sorority.
The opposite of dairymaid is dairyman.
Cock's opposite gender is hen.
Mistress is the opposite gender of master.
the answer is Laundrywoman. However in these days of equal oportunity and the abolition of sex discrimination Laundryman and Laundrywoman has been replaced by Laundryperson
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 fraternity is sorority.
An emperor is the opposite in gender to an empress.
The opposite gender of giantess is giant.
The opposite gender to "negro" is "negra" in Spanish, which translates to "black" and "black woman" respectively.
The opposite gender is girl.
The opposite gender for Joseph is Josephine.
The opposite of dairymaid is dairyman.