A physicist.
A person who studies geography is called a geographer.
A historian studies history.
Someone who studies dialects would usually be referred to as a "Linguist." Depending upon what their studies revolve around, you might hear them called a "Sociolinguist".
An egyptologist is someone who studies Egypt.
florist
A Botanist is someone who studies plants.
Botanist / herbologist studies plants, people who cultivate cannabis are considered growers
Biologist
Agronomist is a person who studies the soil and the plants.
You call someone that studies metal a metallurgist.
A physicist.
A person who studies plants could be an agronomist or a botanist.
Botany
a person who studies planets is a planetologist.
There is no special name for someone who studies Hebrew.
there called a horticulturalist ...