What is the difference between phantoms, ghosts, and other supernatural entities?

Phantoms are typically considered to be a type of ghost, but the term "ghost" is more commonly used to refer to the spirit of a deceased person. Other supernatural entities can include a wide range of beings such as demons, poltergeists, and spirits of nature. Each type of entity may have different characteristics and origins, but they are all generally believed to exist beyond the realm of the living.