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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
A person who studies bees is called an apiologist.
An entomologist is a person who studies insects.
A person who studies audiology would be called an audiologist.
What is the name of a person that studies derivation of
mr. djw studies dinos
A dietician.
Etymologist
zoologist
An entomologist
Horologist