A question I get all the time is what's the difference between a ghost, spirit, entity, etc etc....
In a general sense, they are all interchangeable with one another. These terms are used differently by different groups & individuals. However, while they may all refer to humans that have passed on, they are used specifically to categorize other paranormal encounters.
Ghost: Generally refers to any deceased human still present.
Spirit: Similar to ghost & often interchangeable. Also generally related to beings that where never human to begin with. For instance, elementals...otherwise known as earth, air, fire & water elements, where never human. Elementals are considered side by side with demonic haunts because neither have ever walked this world as humans.
Entity: My personal preference due to its multiple, all encompassing, classification. It's very often used to describe demonic beings.
I feel it's an individual choice as to what you call them. A piece of advice,go for what you're most comfortable with!
Thank you! :)