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hydrologists
The name of a scientist that studies sports is called a sports scientist.
An arachnologist
A scientist who studies crystals is known as a Crystallographer.
A scientist who studies animals is called a zoologist.
A scientist who studies animal life is a zoologist. There is no particular name for a scientist that specialises in platypuses.
A psychologist is the proper name for someone who studies the mind.
The name for this type of scientist is a teuthologist
This answer is a entomologistA scientist who only studies fish is called an ichthyologist.
A proper noun is the name of a specific person, place, or thing. A proper noun for the common noun 'scientist' is the name of a scientist such as Albert Einstein or Marie Curie.
Parasitologist
geologist