EL GÉNERO INGLÉS

CAMBIAN:

Brother - sister

Nephew - niece

Bull - cow

Dog - bitch

Cock - hen

Uncle - aunt

Sir - madam

Man - woman

Gentleman - lady

Male - female

NO CAMBIAN:

Friend - friend

Teacher - teacher

Doctor - doctor

Nurse - nurse

Secretary - secretary

Student - student

en estos casos, y para diferenciar los sexos, empleamos female (hembra) y male (varón.) 

A male teacher: un profesor

A female teacher: una profesora.

También podemos emplear man o woman:

Policeman - policewoman

Salesman - saleswoman

Chairman - chairwoman

-ESS

Master - mistress

God - goddess

Host - hostess

Waiter - waitress

Count - countess