A person who studies weapons is often referred to as a "military historian" or "arms historian." They may also be called a "weapons specialist" or "armaments researcher," depending on their specific focus within the field. Additionally, those who analyze the design and function of weapons might be known as "forensic ballistics experts" in a law enforcement context.
A person who studies ancient weapons might be a military historian, or might be an archaeologist. There is more than one reason to study ancient weapons.
What is the name of a person that studies organisms
An entomologist is a person who studies insects.
A person who studies sand is known as a psammologist.
A person who studies sound is called an acoustician.
What is the name of a person that studies derivation of
A person who studies audiology would be called an audiologist.
A horologist studies time.
mr. djw studies dinos
Etymologist
chiropterologist
zoologist