A physicist.
florist
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.
You call someone that studies metal a metallurgist.
A physicist.
a person who studies planets is a planetologist.
florist
Microbiologists
An Anthropologist.
malacologist
A Zoologist
Brocollogist
Musician.
euclidist
psychologist