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A Ph.d is a doctorate. A person with the letters Ph.d after their name is called a Doctor, even if they did not study medicine.
I guess you can call that person an athlete.
A person who studies medicine is called a medical student.
a nerd.
Micrologist
What is the study of codes
Astronomer
PHILOSOPHER
Smart person
An astronomer
Who study agriculture is called agreerian
A person who sells herbs to be used as medicine is typically called an herbalist or a herbal practitioner.