People who study spirits are often referred to as "parapsychologists" or "spiritualists." Parapsychologists investigate phenomena such as ghosts, psychic abilities, and other supernatural occurrences, while spiritualists may focus more on the communication with spirits and the afterlife. Additionally, those who specifically study the cultural and historical aspects of spirits in various traditions might be called "anthropologists" or "folklorists."
Charlatans.
People who study bugs are called entomologists.
demonology
I think the term you are looking for is "mediums". Mediums Contact Spirits Using Their Physic Energy Of The Paranormal.
Muscology is the study of mosses. Muscologists are people who study mosses.
The scientists who study genetics are called geneticists.
People who study pathology are called pathologists.
The study of ancient people is called Archeology. *correct spelling*
People who study psychology are called psychologists.
people who study sand and just sand is called arenologist
Demonology
It depends on the type of study. Anthropologistsstudy people, but so may scientists, historians, and more.