A person who studies rainbows is called a "rainbowologist."
Meteorologist
An astronomer.
A person who studies Mars is typically referred to as a Martian scientist or a Mars researcher.
A person who studies gravity is called a physicist, while a person who studies vaccines is called an immunologist or vaccinologist.
Snowflake Bentley is a person who studies snowflakes
A person who studies genealogies is a genealogist.
A person who studies philosophy is called a philosopher.
A person who studies organisms is called a biologist.
a person who studies people but not an psychologist
a person that studies gems is called a gemologist.
what do you call somebody who studies snails.
A person who studies birds is called an ornithologist.
A person who studies birds is called an Ornitholoigst
A person who studies poisons is called a toxicologist.
A person who studies lichens is called a lichenologist.
A person who studies theology is called a theologian.