A person who studies gases is typically referred to as a chemist, particularly a physical chemist or a chemical engineer specializing in gas behavior and properties. They may also be known as a gas physicist if their focus is on the physical properties and behavior of gases. Additionally, researchers in fields like atmospheric science or environmental science may study gases in specific contexts, such as air pollution or climate change.
florist
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".
You call someone that studies metal a metallurgist.
A physicist.
a person who studies planets is a planetologist.
There is no special name for someone who studies Hebrew.
florist
Microbiologists
An Anthropologist.
malacologist
A Zoologist
Brocollogist
A physicist.
Musician.