The next letter would be S.
Answer: Gender; Sex
Explanation:
Often people confuse the words gender and sex and often use them together or interchangeably. Gender is the social and the psychological role which makes one either male or female. Then, sex is the the physical aspects of being male or female.
Sex are the biological differences that exist between the males and the females and this include genetic differences. Gender has to do with the characteristics possessed by the males and females.
Departments is the answer
