Alchemist

Alchemist = Person who studies change metal into gold.
Chemist = Person who studies Chemistry.

This is correction to my previous comment. So, miss Hafsa give task to find up more about person and their carrier as a punishment.

Botanist = Person who studies plant and it's structure.
Biologist = Person who studies Biology.
Physicist = Person who studies heat, light, sound etc.
Philologist = Person who studies language development or of particular language.
Pharmacist = Person who prepare and sell medical drug.
Pharmacologist = Person who studies drug and used as medical.
Sociologist = Person who studies development and social behavior.
Cosmologist = Person who studies universe and it's origin.
Janitor = Person who take care the building.
Clean Lady =Person who cleaning house and furniture.
Computer Scientist= Person who degree in computer.
Zoologist = Person who studies animal and it's behavior.
Astronomer = Person who studies space.
Astronaut = Person who work in spacecraft.

This is may not enough. But i already try my best. So, ciaw, see all of you guys n girl in our next class. Sayonara!